  Most papers which explored so far macroeconomic variables took into account
income and wealth. Equally important as the previous macroeconomic variables is
the expenditure or consumption, which shows the amount of goods and services
that a person or a household purchased. Using statistical distributions from
Physics, such as Fermi-Dirac and polynomial distributions, we try to fit the
data regarding the expenditure distribution divided in deciles of population
according to their income (gross and disposable expenditure are taken into
account). Using coefficient of determination as theoretical tool in order to
assess the degree of success for these distributions, we find that both
distributions are really robust in describing the expenditure distribution,
regardless the data set or the methodology used to calculate the expenditure
values for the deciles of income. This is the first paper to our knowledge
which tackles expenditure, especially using a method to describe expenditure
such as lower limit on expenditure. This is also relevant since it allows the
approach of macroeconomic systems using more variables characterizing their
activity, can help in the investigation of living standards and inequality, and
points to more theoretical explorations which can be very useful for the
Economics and business practice.
