User talk:207.73.212.12

April 2009
Welcome to Wikipedia. The recent edit you made to the page Opportunity cost has been reverted, as it appears to be unconstructive. Use the sandbox for testing; if you believe the edit was constructive, please ensure that you provide an informative edit summary. You may also wish to read the introduction to editing. Thank you. Alansohn (talk) 14:03, 2 April 2009 (UTC)

November 2011
Hello, and welcome! Although everyone is welcome to contribute, at least one of your recent edits, such as the one you made to Quake (natural phenomenon) with this edit, did not appear to be constructive, and has been reverted or removed. Thank you! Nepenthes (talk) 19:58, 11 November 2011 (UTC)

Please do not add or significantly change content without citing verifiable and reliable sources. Before making any potentially controversial edits, it is recommended that you discuss them first on the article's talk page. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Tgeairn (talk) 20:00, 11 November 2011 (UTC)

Please stop your disruptive editing. If you continue to vandalize Wikipedia, as you did to Quake (natural phenomenon) with this edit, you may be blocked from editing. Nepenthes (talk) 20:04, 11 November 2011 (UTC)