but the time value of money says you'd rather depreciate an item in its entirety up front than over time. And no assets are depreciated over that length of time, 7 years is the longest for equipment.

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All you need to know about the energy crisis:
ANWR Exploration Republicans: 91% Supported. Democrats: 86% Opposed.
Coal-to-liquid R's: 90% YES. D's: 78% NO.
Oil Shale Exploration R's: 90% YES. D's: 86% NO.
Outer Continental Shelf Exploration R's: 81% YES. D's: 83% NO.
Increased Refinery Capacity R's: 97% YES. D's: 96% NO

SUMMARY: 91% of House Republicans have historically voted to increase the production of America’s own oil and gas. 86% of House Democrats have historically voted against.