let's start with a real-life example, A Person wants to sell his 100 trading cards each for 10 dollars in a day, now he is observing three different people-People who are desperate about trading cards urgently are willing to pay much more money(>>10$)People who do need trading cards urgently are willing to pay Lil bit more money(>10$)People who do need trading cards not urgently are willing to pay less money(
