  This paper presents a model with the aim to follow, as closely as possible,
the rationale of the macroeconomic model advanced by J.M. Keynes in his famous
"The General Theory of Employment, Interest and Money", in order to provide a
viable tool for macroeconomic research. Keynes' main result will be shown,
i.e., to determine the level of income and employment starting from the
marginal efficiency of capital and the marginal propensity to consume, given
the interest rate. Elements of the model will be described by referring to the
original text. The sequentiality in model operation will prove quintessential
in order to describe the complex nature of macroeconomic systems.
