  We extend the exploration regarding dynamical approach of macroeconomic
variables by tackling systematically expenditure using Statistical Physics
models (for the first time to the best of our knowledge). Also, using
polynomial distribution which characterizes the behavior of dynamical systems
in certain situations, we extend also our analysis to mean income data from the
UK that span for a time interval of 35 years. We find that most of the values
for coefficient of determination obtained from fitting the data from
consecutive years analysis to be above 80%. We used for our analysis first
degree polynomial, but higher degree polynomials and longer time intervals
between the years considered can dramatically increase goodness of the fit. As
this methodology was applied successfully to income and wealth, we can conclude
that macroeconomic systems can be treated similarly to dynamic systems from
Physics. Subsequently, the analysis could be extended to other macroeconomic
indicators.
