Interestingly, oil investors experience this boom-and-bust cycle too: every time oil prices spike, a bunch of extra companies flood into the market to drill some wells or weld pipelines or build tankers or whatever. All the extra supply crashes the price and most of the new companies go bankrupt or get consolidated into the big energy firms. This slowly brings spare capacity back down, so the next time there's a disruption the cycle kicks off for its next round.