docs(market): add up to date market research

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diff --git a/docs/.vitepress/config.mts b/docs/.vitepress/config.mts
@@ -74,6 +74,12 @@ export default withMermaid(
               {
                 text: 'Market',
                 link: '/docs/facts/market',
+                items: [
+                  {text: 'Economic Impact', link: '/docs/facts/market#economic-impact'},
+                  {text: 'Perception', link: '/docs/facts/market#perception'},
+                  {text: 'U.S. Segments', link: '/docs/facts/market#market-segments-in-the-united-states'},
+                  {text: 'Consumer Products', link: '/docs/facts/market#consumer-products-and-services'},
+                ],
               },
             ],
           },

diff --git a/docs/docs/facts/market.md b/docs/docs/facts/market.md
@@ -1,14 +1,26 @@
 # The Market
 
-The global language services market is valued at **US$ 60.68 billion** in 2022 and is predicted to reach **US$ 96.21 billion** by the end of 2032 (CAGR=5.94%)[^factmr-lsm].
-Out of which, the global sign language interpretation services market size (including both in-person and remote) was valued at approximately **US$ 0.7 billion** in 2023 and is projected to touch **US$ 1.5 billion** by 2032 (CAGR=8.5%)[^businessresearchinsights].
+To understand the market size, we flow from the global language services market to the specific sign language services market:
+
+- The global language services market is valued at **US$ 60.68 billion** in 2022 and is predicted to reach **US$ 96.21 billion** by the end of 2032 (CAGR of 5.94%)[^factmr-lsm].
+  - ⤷ The translation service market is valued at **US$ 26.6 billion** in 2022[^slator] and **US$ 41.3 billion** in 2024 (CAGR of 2.30%)[^marketresearchfuture].
+    - ⤷ The size of the interpreting market in 2019 was estimated at **US$ 7.6 billion**[^nimdzi].
+      - ⤷ The global sign language interpretation services market size (including both in-person and remote) was valued at approximately **US$ 0.7 billion** in 2023 and is projected to touch **US$ 1.5 billion** by 2032 (CAGR of 8.5%)[^businessresearchinsights].
 
 [^factmr-lsm]: Fact.MR. 2022. [Language Services Market](https://www.factmr.com/report/language-services-market).
+[^nimdzi]: Nimdzi Research. 2019. [Current Size of the Interpreting Market](https://www.nimdzi.com/current-size-of-interpreting-market-nimdzi-finger-food/).
 [^businessresearchinsights]: Business Research Insights. 2024. [Sign Language Interpretation Services Market Size](https://www.businessresearchinsights.com/market-reports/sign-language-interpretation-services-market-112737).
+[^marketresearchfuture]: Market Research Future. 2024. [Translation Service Market](https://www.marketresearchfuture.com/reports/translation-service-market-1400).
+[^slator]: Slator. 2022. [2022 Language Industry Market Report](https://slator.com/slator-2022-language-industry-market-report/).
+
+From a more holistic perspective, the entire sign language economy in the U.S. alone is estimated to range between **US$ 3 billion** and **US$ 10 billion** annually.
+This includes diverse services and sectors that support the deaf and signing community.[^gallaudet]
+
+[^gallaudet]: Gallaudet University. 2022. [How Sign Language is Driving a Multi-Billion Dollar Inclusive Economy](https://gallaudet.edu/president/how-sign-language-is-driving-a-multi-billion-dollar-inclusive-economy/).
 
-### Economic Impact[^who-report]
+## Economic Impact[^who-report]
 
-:::info
+:::tip
 All monetary values in this section are originally reported in 2015 international dollars. For 2024 equivalents, a conversion factor of **1.33** is applied.
 :::
 
@@ -33,7 +45,7 @@ Over a 10-year period, this promises a return of nearly US$ 16 for every 1 dolla
 [^who-report]: World Health Organization. 2021. [World Report on Hearing](https://www.who.int/publications/i/item/world-report-on-hearing).
 [^who-report-annex]: World Health Organization. 2021. [World Report on Hearing, Web Annex B: The Return on Investment From Actions To Prevent and/or Mitigate the Impact of Hearing Loss](https://iris.who.int/bitstream/handle/10665/339906/9789240021501-eng.pdf).
 
-### Perception and Impact
+## Perception and Impact
 
 Disabled people face significantly more challenges than non-disabled people in accessing products (41.6% vs. 15.8%) and services (51.5% vs. 25.2%)[^ons].
 [^ons]: Office for National Statistics. 2021. [Disabled people’s access to products and services, Great Britain: February to March 2022](https://www.ons.gov.uk/peoplepopulationandcommunity/healthandsocialcare/disability/articles/disabledpeoplesaccesstoproductsandservicesgreatbritain/februarytomarch2022).
@@ -43,11 +55,110 @@ National Captioning Institute research[^nci] found that 66% of viewers of captio
 
 [^nci]: National Captioning Institute. 2004. [Commercial and Infomercial Captioning](https://web.archive.org/web/20070815181532/https://www.ncicap.org/commcap.asp).
 
-### Existing Market Products and Services
+Examples of companies investing in sign language in recent years:
+
+- **Chase Bank** and **Starbucks** opened a "signing branch" near Gallaudet University and hired Deaf employees
+- **Comcast** [established](https://www.forbes.com/sites/sarahkim/2019/12/03/comcast-asl-now/#65a36e3b6dc1) customer service in ASL (https://aslnow.com/)
+- **Proctor Gamble** established an internship program with Gallaudet University
+- Recent partnerships with Gallaudet University: **Microsoft**, **Qualcomm**, **Google**, **NSA**, **IDB** (Inter-American Development Bank)
+- **Zoom**, **Flipgrid**, **GoReact** are only a few examples of video-based companies which have quickly realized heeding the input of Deaf consumers is key to their business.
+- **Apple** partnered with Gallaudet University to spotlight schools for the deaf, and deaf-owned businesses (https://gallaudet.edu/signing-ecosystem/)
+
+## Market Segments in the United States
+
+The sign language services market is segmented into various categories, including:
+The entire sign language economy in 2022 in the U.S. alone is estimated to range between **US$ 3 billion** and **US$ 10 billion** annually.[^gallaudet]
+
+### Uncategorized[^gallaudet-numbers]
+
+Early intervention = **US$ 14.6 million** in federal funding alone<Badge type="danger" text="Citation Needed" />,
+plus 1-2 million per state (50-100 million) = **US$ 114.6 million** maximum<Badge type="danger" text="Citation Needed" />
+
+Schools for the Deaf have a **US$ 14 million** average budget<Badge type="danger" text="Citation Needed" />.
+Given 85<Badge type="danger" text="Citation Needed" /> schools, Deaf education is estimated at **US$ 1.2 billion**.
+Adjusted to **US$ 80,000** average cost per student<Badge type="danger" text="Citation Needed" />, given 7,189 students<Badge type="danger" text="Citation Needed" />, it is estimated at **US$ 575 million**.
+
+Interpreting Services are estimated given a **US$ 83,313** average yearly salary[^interpreters-salary]
+times 10,385 certified interpreters[^rid] gives **US$ 865 million**.
+In 2021, they were estimated to be **US$ 1.2 billion**[^einpresswire].
+
+[^interpreters-salary]: Indeed. 2024. [Sign language interpreter salary in United States](https://www.indeed.com/career/sign-language-interpreter/salaries).
+[^rid]: Registry of Interpreters for the Deaf. 2024. [Publications](https://rid.org/programs/membership/publications/).
+[^einpresswire]: Einpresswire. 2021. [1.2 billion ASL interpretation market presents opportunity for consolidation](https://www.einpresswire.com/article/539608436/1-2-billion-asl-interpretation-market-presents-opportunity-for-consolidation).
+
+Transition services to address failures in sign language access in education and other factors are estimated to cost **US$ 313.5 million**.
+
+- **Postsecondary Education Support**: The Postsecondary Education Center for Individuals who are deaf or Hard of Hearing receives **US$ 1.3 million** to support collaborations with postsecondary institutions, SEAs, LEAs, State VR agencies, VR service providers, and other organizations to meet the educational and vocational needs of individuals who are deaf or hard of hearing[^usdoe-postsecondary].
+- **Vocational Rehabilitation Services**: 94,000 clients in the Vocational Rehabilitation System are deaf, which means 7.9% of the total appropriations for vocational rehabilitation services at **US$ 3.76 billion** is allocated to services in sign language, at **US$ 297 million**[^national-deaf-center-vr].
+- **Helen Keller National Center**: The Helen Keller Center for Deaf-Blindness receives **US$ 16 million** in funding from the U.S. government[^helen-keller].
+
+[^usdoe-postsecondary]: U.S. Department of Education. 2019. [Postsecondary Education Support for Individuals who are Deaf or Hard of Hearing](https://www2.ed.gov/about/overview/budget/budget19/justifications/h-specialed.pdf).
+[^national-deaf-center-vr]: National Deaf Center. 2020. [Vocational Rehabilitation Services and Deaf Americans](https://www.nationaldeafcenter.org/news/room-improvement-new-report-analyzes-vocational-rehabilitation-services-and-deaf-americans#:~:text=Better%20Understanding%20of%20Who%20is%20Being%20Served&text=Of%20those%20people%20who%20applied,of%20all%20VR%20case%20files).
+[^helen-keller]: U.S. Department of Education. 2021. [Rehabilitation Services Justification](https://www2.ed.gov/about/overview/budget/budget21/justifications/j-rehab.pdf).
+
+### Sign Language Teaching (to hearing people)
+
+Hanover Research estimates that the potential size of the market for online ASL
+courses in colleges/universities (in terms of revenue from tuition) is projected to **US$ 122 million** by 2022.[^hanover]
+Under the assumption that 20% of all ASL instruction will be provided online.
+
+[^hanover]: Hanover Research. 2014. [Online American Sign Language Market Study](https://drive.google.com/file/d/1Dbw9U_aY5JC54E07667RVat-BDY5zXTF/view).
+
+In 2014, online ASL tuition rates range from **$271 to $394 per hour**.
+Gallaudet University currently charges **$993** for its online ASL courses[^gallaudet-fall-courses].
+
+[^gallaudet-fall-courses]: Gallaudet University. 2023. [Fall 2023 Online Courses](https://sites.google.com/gallaudet.edu/ccoe/online-courses/fall-online-courses).
+
+ASL classes in K-12 public education are estimated at **US$ 37.2 million** in 2017[^american-councils].
+
+[^american-councils]: American Councils. 2017. [National K-12 Foreign Language Enrollment Survey Report](https://www.scribd.com/document/350069842/National-K-12-Foreign-Language-Enrollment-Survey-Report#from_embed).
+
+Baby signing classes and materials in 2018, is "at minimum", **$US 25 million**[^nytimes].
+
+[^nytimes]: New York Times. 2018. [Sign Language Isn't Just for Babies](https://www.nytimes.com/2018/05/23/opinion/sign-language-isnt-just-for-babies.html).
+
+### Deaf Education
+
+Supporting deaf students in mainstream schools is estimated to be between **US$ 10,558 and US$ 20,000** per student in 2004[^high-expenditure].
+With 400,000 deaf and hard of hearing students in the U.S. and 7,189 attending deaf schools<Badge type="danger" text="Citation Needed" />, the cost is estimated to range from **US$ 4.15 to 7.86 billion**.
+
+[^high-expenditure]: U.S. Department of Education. 2004. [Characteristics of High-Expenditure Students with Disabilities](https://files.eric.ed.gov/fulltext/ED522071.pdf).
+
+### [Telecommunications Relay Services](https://www.fcc.gov/trs)
+
+The Federal Communications Commission (FCC) spends approximately **US$ 1.9 billion** per year ($159 million per month[^fcc-dvc]) on all relay services.
+Their public reports do not provide detailed breakdowns by service type.
+However, the total TRS Fund budget for the 2024-2025 Fund Year is approximately **US$ 1.49 billion\*\*[^fcc-vrs].
+
+[^fcc-dvc]: Federal Communications Commission. 2024. [Direct Video Calling Data](https://www.fcc.gov/sites/default/files/CSD-DVC-Data.pdf).
+[^fcc-vrs]: Federal Communications Commission. 2024. [Structure and Practices of the Video Relay Service Program](https://docs.fcc.gov/public/attachments/DA-24-620A1.pdf).
+
+| Service                                                                                    | Description                                                                                                                  | Audience                                  | Cost (Per Minute)[^fcc-vrs]                              |
+| ------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------- | -------------------------------------------------------- |
+| [Direct Video Calling (DVC)](https://www.fcc.gov/direct-video-calling-dvc)                 | Direct video calls to sign language-fluent customer service representatives.                                                 | ASL users; customer service interactions  | Undisclosed                                              |
+| [Video Relay Service (VRS)](https://www.fcc.gov/vrs)                                       | Video calls with an interpreter facilitating communication between ASL users and hearing individuals.                        | ASL users                                 | $8.06 (small providers); $6.51 (Tier 1); $4.07 (Tier II) |
+| [IP Relay](https://www.fcc.gov/ip-relay)                                                   | Voice calls with text relay operators communicating through a teletypewriter (TTY).                                          | Users with hearing or speech disabilities | $2.12                                                    |
+| Traditional TTY-Based TRS                                                                  | Enables text-based communication using teletypewriter devices over traditional phone lines.                                  | Users with hearing or speech disabilities | $6.12                                                    |
+| Speech-to-Speech Relay Service (STS)                                                       | Facilitates communication for individuals with speech disabilities via relay operators trained to understand unclear speech. | Users with speech disabilities            | $7.25                                                    |
+| Captioned Telephone Service (CTS)                                                          | Allows individuals with hearing loss to read captions of what the other party says while speaking.                           | Users with hearing loss who can speak     | $2.78                                                    |
+| [Video Remote Interpreting (VRI)](https://en.wikipedia.org/wiki/Video_remote_interpreting) | Video interpreting for on-site or private use, often in hospitals or businesses.                                             | ASL users; private settings               | Not regulated by the FCC[^fcc-vri]                       |
+
+[^fcc-vri]: Registry of Interpreters for the Deaf. 2012. [VIDEO REMOTE INTERPRETING](https://web.archive.org/web/20121119001737/http://www.rid.org/UserFiles/File/pdfs/Standard_Practice_Papers/VRI_SPP.pdf).
+
+Looking at the combined revenue of VRS providers, the VRS market alone is estimated at
+**US$ 480 million** for 2019[^gallaudet-numbers], and
+**US$ 626 million** for 2023[^vrs-breakdown].
+
+[^gallaudet-numbers]: Gallaudet University. 2022. [The Sign Language Economy = Numbers and Impact](https://docs.google.com/document/d/1Bq4S2XS0tytivVDsNNkAa0IOcEDSVs__O57yMc_94VY/edit?tab=t.0).
+[^vrs-breakdown]: Multilingual. 2023. [Breaking Down Changes to Video Relay Service Industry](https://multilingual.com/breaking-down-changes-to-video-relay-service-industry/).
+
+For VRI, in the United States, similar estimates of **US$ 250 million**[^gallaudet-numbers]
+and **US$ 1.81 billion** worldiwde.
+
+## Consumer Products and Services
 
 :::danger
 Citations needed.
-:::
 
 | **Service Type**                                    | **Description**                                                                                                                      | **Typical Consumer Price**                                                                                            |
 | --------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------------- |
@@ -61,9 +172,4 @@ Citations needed.
 | **Public Services and Accessibility**               | Providing interpreters to make public services like government offices and hospitals accessible to the deaf community.               | Often subsidized or funded by government programs.                                                                    |
 | **Telecommunications and Customer Support**         | Enables deaf individuals to communicate with customer service via sign language interpreters over video calls.                       | $1.50 to $3.00 per minute for VRI.                                                                                    |
 
-### Market Segments
-
-The sign language services market is segmented into various categories, including:
-:::danger
-TODO
 :::
diff --git a/docs/docs/facts/population.md b/docs/docs/facts/population.md
@@ -10,10 +10,7 @@ This section explores the global funnel from hearing loss to deafness and its si
 1. **1.5 billion people** experience hearing loss globally.
 2. **430 million people** require rehabilitation for disabling hearing loss.
 3. **70 million people** are considered deaf.
-4. **12[^ecml]-24[^derivation] million people** natively use sign languages.
-
-[^ecml]: European Centre for Modern Languages. 2024. [Facts about sign language](https://edl.ecml.at/Facts/FAQsonsignlanguage/tabid/2741/language/en-GB/Default.aspx).
-[^derivation]: Derivation. 2022. [International Day of Sign Languages 2022](https://derivation.co/international-day-of-sign-languages-2022/).
+4. **12[^ecml]-24[^derivation]-25[^sheets] million people** natively use sign languages.
 
 ```mermaid
 sankey-beta
@@ -51,15 +48,21 @@ These impairments are defined per ear, as follows[^who-report]:
 ### Deafness[^wfd]
 
 Among those with disabling hearing loss, the **World Federation of the Deaf (WFD)** estimates there are approximately **70 million deaf people worldwide**.
-This community spans over **200 sign languages**, underlining the linguistic diversity of deaf populations.
+This community spans over **200 sign languages** (or over _300_[^un-national-day]), underlining the linguistic diversity of deaf populations.
 From our research, it is unclear how many people use sign languages.
 
 [^wfd]: World Federation of the Deaf. 2024. [Our Work](https://wfdeaf.org/our-work/).
+[^un-national-day]: United Nations. 2024. [International Day of Sign Languages](https://www.un.org/en/observances/sign-languages-day).
 
 It is unclear how many people use sign languages.
 The European Centre for Modern Languages[^ecml] estimates that on average,
 deaf sign language users make up about 0.16% of the whole population in any given country, amounting to 12 million people worldwide.
-According to Ethnologue (via Derivation[^derivation]), there are 24 million native sign language users worldwide.
+According to Ethnologue (via Derivation[^derivation]), there are 24 million native sign language users worldwide,
+and according to a conglomeration of sources[^sheets], the number signers for the top 100 used sign languages is 25 million.
+
+[^ecml]: European Centre for Modern Languages. 2024. [Facts about sign language](https://edl.ecml.at/Facts/FAQsonsignlanguage/tabid/2741/language/en-GB/Default.aspx).
+[^derivation]: Derivation. 2022. [International Day of Sign Languages 2022](https://derivation.co/international-day-of-sign-languages-2022/).
+[^sheets]: Shester Gueuwou. 2023. [Sign Language Info](https://docs.google.com/spreadsheets/d/1O6frH52v4R9RbhWOA-FqRj2W3U-0yC2xC3qroxcq4kQ/edit?gid=1380277111#gid=1380277111)
 
 ### Sign Language Interpreters