I'll posit a mechanism: when times are good, small organizations are born, growing out of people's spare time and sense of security in the future. After all, by definition organizations start small. And then when times are bad, small organizations are the first to die, because they lack the economies of scale and financial reserves that allow them to weather a contraction. We've entered a time of scarcity since COVID; that's put severe pressure on many smaller organizations, leading to them withering and shrinking away.
Interestingly, bad times often lead to large organizations becoming dysfunctional, but not dying because they have sufficient reserves to weather the storm. We see this with Big Tech now; we saw it with American automakers in the 1970s. During the next expansion period they often lose competitiveness to new startups, and then in the next contraction they die and their replacements become large organizations.