Final answer:
Many states have usury laws that impose upper limits on interest rates, but these limits are often well above market rates. Therefore, there are no regulations specifying a minimum interest rate for subprime loans.
Step-by-step explanation:
Many states have usury laws that impose upper limits on the interest rates lenders can charge on loans. However, these upper limits are often well above the market interest rates. For example, if the interest rate is not allowed to rise above 30% per year, it can still fluctuate below that level according to market forces. Therefore, there are no specific regulations or guidelines in place nowadays that dictate subprime loans must not have interest rates or APRs lower than a certain threshold.