Tech companies are spending big on the AI craze, but it will be a while before they have much — if anything — to show for it.As companies prepare to spend over $1 trillion on artificial intelligence, a Goldman Sachs report examined the big question at hand: "Will this large spend ever pay off?"That sizable investment will go toward the data centers needed to run AI, the power grid, and AI chips. But shortages of those AI ingredients could lead to disappointing returns for companies. Related stor...