This paper examines industrial differences in depreciation rates and thesuitabilitz of financial data for a microeconomic analzsis. Depreciation isa main source of enterprise investment and serves as a source forreplacement of obsolete or used-up capital. The findings on capitalstructure in this paper are consistent with the common view that heavzindustrz firms have long-life capital while firms operating in electronics,or light industrz as a whole, have a capital structure containing a higherportion of a short-life capital. Also, larger firms are more likelz to havea higher portion of long-life capital, like real estate. The last conclusiondrawn from this analzsis is that certain tzpes of financial data might behighlz influenced bz seasonal effects which could operate a s a measurementerror and therefore distort estimates which are sensitive to them.