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Recommended usage:

1. Create a personal copy, either from File -> Make a Copy (Gdoc) or File -> Download as

2. Use a spreadsheet program such as Google Documents, Microsoft Excel, SoftMaker PlanMaker, or OpenOffice.org Calc to process the spreadsheet.

3. Use filtering (the downward facing arrows at column tops) to eliminate unwanted data. For example, if you're not interested in buildings that payout in less than 8 hour increments, uncheck 0.08333, 1, 3, and 6 from the "Output Time (hrs)" column.
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Practical realities of working live with the spreadsheet:

Global editing must be set to enable sorting and filtering. This means anyone can fully edit or delete the worksheet. To mitigate this concern I've included as a locked worksheet a "factory fresh" original. If the working copy goes south, simply use the "Duplicate" function to create a fresh editable copy.
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About this this spreadsheet:

Currently this is an ad-hoc project. As such it is subject to instability or obsoletion. For now use the below forum thread for discussion:
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http://www.funzio.com/forum/showthread.php?15477-Economy-planning-amp-discussion
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