The embodied technical change should reduce the cost of
production of the commodity. However, price structure, wages and
interest rates also will change over time. Thus if a commodity is
following a fixed price regime, the adjustment of a historical
input-output table to current price wage level will leaves less and less
profit per unit of output. The extent of this reduction will indicate
the extent of technological change. There are different approaches to
the prediction of changes in input-output coefficients. The first
approach, attributable to Leontief (1941) and Stone (1962), assumes that
input-output matrices change over time in a “biproportional” way. The
other approach is to estimate trends in individual coefficients using
statistical data. Former approach is used by a number of experts,
including Fontela, et al. (1970), Almon, et al. (1974) and Carter
(1970). Arrow and Hoffenberg (1959), Henry (1974), Savaldson (1970,
1976), Ozaki (1976), Aujac (1972) and Buzunov (1970). These are examples
of the application of the quantitative approach for forecasting
input-output coefficients. Still another approach which could not get
much attention for forecasting input-output coefficients, is
constructing the marginal input-output coefficients [Tilanus (1967);
Middelhoek (1970)]. Marginal coefficients for forecasting constructed by
Tilanus and Middelhoek are based on average input-output tables, which
shows that still new approach (marginal) is based on the old (average)
one
Measuring Change Over Time in Socio-economic Deprivation and Health in an Urban Context: The Case Study of Genoa
