This video also give us an example of a trend of recent years that is really awful:

In very short cycles, going on a hire spree and then redundancies plans without real consequences for the management or companies. Basically it costs them almost nothing to mess with people's lives.

For example, when doing unreasonable mass hiring, the market goes up, because it is a sign of growth. Then, when firing people in mass, the market value also goes up because it is supposed a sign for short term increased revenue.