In any case of the budget deficit the private sector of the economy receives more from government expenditure than it pays in taxes. - Michał Kalecki

It may thus be concluded that in the absence of 'development factors' the system lapses into a stationary state. These factors thus appear to be a prerequisite of a steady growth.

We have found that the degree of monopoly is likely to increase somewhat during depressions.

It is the export surplus and the budget deficit which enable the capitalists to make profits over and above their own purchases of goods and services.
The connection between 'external' profits and imperialism is obvious.