18 March 2023

• curprev 16:1316:13, 18 March 2023‎ imported>Doug Williamson‎ 2,088 bytes +170‎ Mend link.
• curprev 16:0716:07, 18 March 2023‎ imported>Doug Williamson‎ 1,918 bytes +486‎ Add definition. Source: Linked pages

27 September 2022

• curprev 14:5814:58, 27 September 2022‎ imported>Doug Williamson‎ 1,432 bytes +32‎ Add link.

7 July 2022

• curprev 21:1221:12, 7 July 2022‎ imported>Doug Williamson‎ 1,400 bytes +13‎ Add link.

16 December 2021

• curprev 13:0813:08, 16 December 2021‎ imported>Doug Williamson‎ 1,387 bytes +40‎ Expand first definition.
• curprev 11:5411:54, 16 December 2021‎ imported>Doug Williamson‎ 1,347 bytes +118‎ Expand definition.
• curprev 11:4811:48, 16 December 2021‎ imported>Doug Williamson‎ 1,229 bytes +1‎ Layout.

6 November 2020

• curprev 21:5621:56, 6 November 2020‎ imported>Doug Williamson‎ 1,228 bytes +12‎ Layout.
• curprev 21:5521:55, 6 November 2020‎ imported>Doug Williamson‎ 1,216 bytes +274‎ Add second definition.

15 May 2020

• curprev 00:5500:55, 15 May 2020‎ imported>Doug Williamson‎ 942 bytes −17‎ Remove surplus link.
• curprev 00:5200:52, 15 May 2020‎ imported>Doug Williamson‎ 959 bytes +959‎ Create page. Source: Economics help webpage https://www.economicshelp.org/micro-economic-essays/marketfailure/public-goods/