Talk:Externality

Business Mid‑importance

	Business portal This article is within the scope of WikiProject Business, a collaborative effort to improve the coverage of business articles on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.BusinessWikipedia:WikiProject BusinessTemplate:WikiProject BusinessWikiProject Business articles
Mid	This article has been rated as Mid-importance on the project's importance scale.

Economics Top‑importance

	Business and economics portal This article is within the scope of WikiProject Economics, a collaborative effort to improve the coverage of Economics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.EconomicsWikipedia:WikiProject EconomicsTemplate:WikiProject EconomicsEconomics articles
Top	This article has been rated as Top-importance on the project's importance scale.

This article has been mentioned by a media organization:

Kim Tae-gyu (5 July 2009). "'Green Card' Set for Eco-Friendly Firms". The Korea Times.

Archives

1, 2

This page has archives. Sections older than 365 days may be automatically archived by when more than 5 sections are present.

Wikipedia Ambassador Program assignment

This article is the subject of an educational assignment at University of Kentucky supported by WikiProject United States Public Policy and the Wikipedia Ambassador Program during the 2011 Spring term. Further details are available on the course page.

Above message substituted from {{WAP assignment}} on 14:32, 7 January 2023 (UTC)

Negative of cellphone at school

Negative of cellphone at school 196.207.37.208 (talk) 17:00, 10 May 2022 (UTC)[reply]

Negative Production Externality Figure Incorrect?

This url shows a different figure for negative externality in production. https://www.economicsonline.co.uk/market_failures/externalities.html/

Logically, the wiki figure is incorrect. A negative externality in production means that the socially optimal production should be lower and the equilibrium price should be higher. The figure has all of this backwards. An example to consider is pollution from a factory; negative externality in production. Society would be better off with less production from the factory with less pollution and a higher price for the factory output. — Preceding unsigned comment added by Opulent1 (talk • contribs) 23:21, 10 May 2022 (UTC)[reply]

I've decided to remove it, along with the positive production externality figure, as it is also incorrect. Surprised it wasn't removed earlier. ARandomName123 (talk) 15:26, 15 May 2023 (UTC)[reply]

Mas-Colell formula

I have removed the Mas-Colell formula because (a) it is probably a verbatim copy of the material in the cited book, which contravenes WP:COPYVIO unless it is a loose paraphrase (which is highly improbable if not impossible); (b) Wikipedia is not an economics text book and the level of prior knowledge required to understand the working is far more that we expect of the general readership, making it wp:UNDUE (and even designed to intimidate); (c) it is a WP:SINGLESOURCE and a WP:PRIMARYSOURCE.

If anyone really thinks it should be restored, please respond to these challenges first. 𝕁𝕄𝔽 (talk) 15:06, 20 September 2022 (UTC)[reply]

Incorrect production externality graphs

Both graphs for the positive and negative production externalities are incorrect.

Please see: Negative externalities (economicsonline.co.uk) and Positive Externalities - Economics Help.

The creator of the graphs seems to have flipped private marginal cost and social marginal cost. I've decided to remove both graphs, but a second opinion would be appreciated, along with a check of the other two graphs. ARandomName123 (talk) 15:25, 15 May 2023 (UTC)[reply]