What's the Economic Engine for All These High Yields?

i keep asking you on twitter and elsewhere, for any one to tell me what the economic engine is for all these high yields. And i always get these vague answers, oh, it's a basis trade or whati. I said, find arbitrage. Yes, show me. Show me the i say, put money in a bo do that an yepl come along and they put money in the box. It will take some money out of the box. Asko the best explanation on this note.