Sunk cost refers to the cost that cannot be changed by any decision made now or in the future because the decision made in the past has already occurred. From a rational point of view, sunk costs should not affect our decision-making. However, we often make a lot of irrational decision-making behaviors because we want to recover or avoid sunk costs. This is called the sunk cost effect.
According to the above definition, which of the followings is not a sunk cost effect?
Xiao Wang bought a bottle of soda for 20 yuan. He found that it tasted bad and wanted to throw it away. However, considering that it was so expensive and could not be refunded, he resisted and drank it all.