We talked about "The cost of zero cost." Zero makes us happy, but it can also be a problem. That is, something you had no intention of buying at all becomes surprisingly attractive once it is FREE.

We think that what is being provided is very valuable. This may be because people are essentially afraid of losses. If you choose free, you don't have to worry about losing anything in sight. However, if you choose something that is not free, the risk remains that you may have made the wrong choice. So, if you were asked which you would choose, you would choose the free one.