> When they run out of warehouses to build (or crazy ideas to invest in) their costs will drop and that will turn into profit in an instant. I don't think ther

> When they run out of warehouses to build (or crazy ideas to invest in) their costs will drop and that will turn into profit in an instant. I don't think there's any evidence to back that up. There are two types of costs- fixed costs and variable costs. Costs associated with setting up new warehouses are variable in the short term, and sure, those will drop to zero when they choose to stop building them. But there are substantial fixed ongoing costs associated with operating warehouses and any change in market dynamics (high unemployment, lower consumer confidence, market crashes) can cause their costs to outstrip their revenue. Just because they are Amazon doesn't make them immune to the same P&L considerations that affect every other retailer. I just don't see much evidence looking back at Amazon's history to suggest that they can suddenly become wildly profitable when they haven't been able to in 20+ years.