Final answer:
People are likely to put another dollar into a vending machine after losing a dollar because of the sunk cost fallacy. They become attached to their prior investment and believe that continuing to invest will increase their chances of winning.
Step-by-step explanation:
The likelihood of someone putting another dollar into a vending machine after losing a dollar can be explained by the sunk cost fallacy. This fallacy occurs when people continue to invest in something that has already proven to be a loss, based on the belief that the prior investment justifies further investment.
In the case of the vending machine, losing a dollar may lead individuals to think that if they keep putting more money in, they are more likely to eventually win and get their money back. They become attached to the past investment and have difficulty accepting the loss. This is similar to the behavior seen in gambling, where individuals keep trying and hoping for a big win despite experiencing losses.