Present Bias discount
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Present Bias Discount Calculator helps to understand how people make financial decisions when influenced by a present bias. Present Bias is a concept in behavioral economics that describes the tendency of people to prefer immediate rewards over future rewards, even if future rewards are greater. This is modeled by the formula βδ^t, where β is a discount factor that reflects the preference for immediate rewards and δ is a temporal discount factor that reflects the preference for future rewards.
The formula βδ^t is used to calculate the present value of a future reward. The factor β, which is less than 1, represents the reduction in the value of the reward due to present bias. The factor δ, which is also less than 1, represents the reduction in the value of the reward due to the passage of time. When β is less than 1, the person tends to prefer immediate rewards over future rewards.
A common example of Present Bias is when a person decides to spend money on a good now instead of saving for a long-term goal. This can occur even if the person knows that saving for the long-term goal is the more rational decision. Present Bias can have negative consequences, such as a lack of savings for retirement or the accumulation of debt.
It's essential to be careful when using the Present Bias Discount Calculator, as results may vary depending on the values of β and δ. Additionally, it's crucial to remember that Present Bias is just one of many behavioral biases that can influence financial decisions.
Frequently asked questions
What is Present Bias?
Present Bias is a concept in behavioral economics that describes the tendency of people to prefer immediate rewards over future rewards.
How does the formula βδ^t work?
The formula βδ^t is used to calculate the present value of a future reward, considering present bias and the passage of time.
What are the consequences of Present Bias?
Present Bias can have negative consequences, such as a lack of savings for retirement or the accumulation of debt.
How can I use the Present Bias Discount Calculator?
Simply enter the values of β and δ, and the calculator will provide the present value of the future reward.