The thirties are known by economists as being the decade of the Crisis of 29 and also the years
of non-stagnation of the economic policy of the US government, as well as of several European
countries. Keynesian economic policies, despite many successful experiences, have continued
to be “attacked” since the launch of Master Keynes's General Theory. It is possible to attribute
its success by significantly reducing unemployment rates, mainly by increasing public
investment spending. This is because the main “weapon” that the government can use to reduce
the high level of unemployment, when an economy is in a cyclical state of recession or
depression, is public investment, preferably that investment in basic social capital and
generation of socioeconomic infrastructure. In this article, we intend to discuss the economic
importance of financing public investments and its implications, based on Keynes's theory. For
this, it is urgent to adopt an exploratory-qualitative approach as a methodological procedure.The main conclusion is that government investment decisions, especially in public works of
great socioeconomic reach, can break through the barrier of mistrust in relation to the uncertain
future and recover the animal spirit of the investing entrepreneur in times of crisis. Keynes is
certainly the right choice among the many economists who have contributed to the economic
sciences, as it has motivated governments, statesmen, policy makers, the academy, and the
opinion of those who support their systems of ideas in the literature of political philosophy and
science economic conditions outside the mainstream.
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