I want you to think about these two statements that you made:

But there is no situation where companies simply stop taking money.

But the op proposed that PC component vendors stock would drop and therefore no one would build PC parts.

These cannot both be true. PC Component vendors will NOT stop selling parts and customers will NOT stop building PCs because that is leaving money on the table. They will source components from whoever will sell them at whatever price they can get. That is what WILL happen.