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What prevents interest rates from rising?
A lot of loans are taken out on a fixed rate basis, so the rate is part of the contract and is therefore covered by contract law. If the loan is taken out on a variable basis then in principle the rate can rise within the terms of the contract.  If a particular lender tries to raise its rates out of line with the market then its customers will seek alternative, cheaper, loans and pay off their expensive loan if they can. If rates rise sharply in general due to unusual politico-economic circumstances then those with variable rate loans can find themselves in severe trouble.  For example the base rate in the UK (and therefore variable mortgage rates closely tied to it) spiked sharply in the late 80s which caused severe stress to a lot of borrowers and undoubtedly pushed some into financial difficulties.