Marketing research firms that collect certain information on a regular basis, which they then sell to interested clients, are involved in what kind of research?

The answer should be a.

Afederal parliamentary republic is  unlimited.

In financial aspects, a depression is a sustained, long haul downturn in monetary movement in one or more economies. it is a more extreme monetary downturn than a recession, which is a slowdown in financial action through the span of a typical business cycle. a depression is an irregular and extreme type of recession. so depression is always followed by recession but it is not correct to state that a depression always follow a recession.