One most frequently considers efficiency when undertaking investment
activities and comparing various investment options, looking for one that will
bring the best effect. Efficiency is measured using partial, synthetic indexes of
resource productivity (labor, capital), and can be identified in terms of ex-post
and ex-ante. When calculating ex-ante efficiency, one assesses the expected
results with the involvement of particular resources and time. The ex-post
efficiency consists of determining the results of specific activities. In general,
one uses a ratio analysis to assess efficiency.