User talk:Davidisbadatlife

December 2008
Welcome to Wikipedia. The recent edit you made to 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. --Unpopular Opinion (talk · contribs) 12:52, 2 December 2008 (UTC)

The recent edit you made to Opportunity cost constitutes vandalism, and has been reverted. Please do not continue to vandalize pages; use the sandbox for testing. Thank you. --Unpopular Opinion (talk · contribs) 12:52, 2 December 2008 (UTC)