Originally Posted by
Walt
A bank might need a billion in US Dollar assets. The banker does not care if the dollar goes up or down, he just needs those dollars. He could keep a billion in cash in a vault, but that costs money, and loses about 2% a year to inflation. He could invest in stocks or bonds that might go up in value, but they also might collapse in value, in which case the banker would go to prison. Or he could buy US Treasurys which the banker feels are absolutely guaranteed. They may pay only 1%, less than the 2% lost to inflation, but that is 1% more than just keeping the cash in a vault.
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