While it is important for the consumer to shop around for the best interest rate, the lowest interest rate is not always the best. Lenders, like other companies, rely on competition and advertising for their business. Some banks and lending institutions will advertise a phenomenally low interest rate in order to attract prospective borrowers. The interest rate may be as much as a few points below what other lenders have offered. Consumers should be aware, however that this low interest rate may come with a high price tag. In order to makeup for the lost revenue of the low interest rate, lenders will include restrictions and penalties in the terms of the loan. Frequent restrictions included limiting the attractive low interest rate to only a portion of the entire length of the loan, such as one to three years. After that time period, the interest rate will rise to the current prime rate at the time. Another common restriction allows the lender to charge a penalty to the consumer should they decide to refinance the loan with another lender at a later point in time. The penalty is often so cumbersome it makes the savings of refinancing minimal.