  An economic interpretation of the Caputo derivatives of non-integer orders is
proposed. The suggested economic interpretation of the fractional derivatives
is based on a generalization of average and marginal values of economic
indicators. We formulate an economic interpretation by using the concept of the
T-indicator that allows us to describe economic processes with memory. The
standard average and marginal values of indicator are special cases of the
proposed T-indicator, when the order is equal to zero and one, respectively.
The fractional derivatives are interpreted as economic characteristics
(indicators) that are intermediate between the standard average and marginal
values of indicators.
