SpaceX just pulled off the largest IPO in history, and it is already asking lenders for another $40 billion to buy Nvidia chips. The chips aren't the story. The borrowing is. When an entire build-out shifts from cash flow to credit, the price lenders charge starts setting the pace, and the first real test of that price arrives with this deal.

Nvidia and the Nasdaq closed at records on Monday. The 10-year Treasury yield hit its highest level since 2002 on the same day, and it did so after a weak jobs report that should have pushed it lower. That is the detail most headlines missed. Stock prices are a race between growing profits and a rising discount rate, and right now AI profits are winning. Earnings season starts next week. Here is what has to go right for that to continue, and the 1 thing that only has to go wrong.