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What prevents interest rates from rising?
Interest rates are market driven. They tend to be based on the prime rate set by the federal reserve bank because of the tremendous lending capacity of that institution and that other loan originators will often fund their own lending (at least in part) with fed loans. However, there is no mandatory link between the federal reserve rate and the market rate. No law stipulates that rates cannot rise or fall. They will rise and fall as lenders see necessary to use their capital. Though a lender asking 10% interest might make no loans when others are willing to lend for 9%. The only protection you have is that we are (mostly) economically free. As a borrower, you are protected by the fact that there are many lenders. Likewise, as a lender, because there are many borrowers. Stability is simply by virtue of the fact that one market participant with inordinate pricing will find fewer counterparties to transact.