1. The fluctuations in stock prices. Like many tech companies, Google uses its shares in place of currency. This work great when prices are going up.
2. Business spending on advertising. Despite ambitions in other areas, the company still just mostly sells ads. One of the first things companies cut back on when they start hurting is advertising.
When the stock market declines because the business cycle turns, Google gets a double whammy. In many ways, it's the canary's canary in the coal mine. Doubly levered to the business cycle.
There is such a taboo around pay cuts, that then the inevitable downturn happens, the only option is to first stop hiring and then start laying off.
I expect GOOG to be the epicenter of tech worker pain for this leg of the cycle.
During these booms, tech leaders take on a mythological quality. To even suggest that they could begin a protracted decline seems absurd. But it has happened time and again. Maybe it's this time or the next cycle that does it, but there's no version of the future where GOOG retains its dominating position.