In our daily lives we make number of choices. Some of these choices are monetary meaning these choices involve money and some of these choices are non monetary meaning they don't involve money. All these choices are driven by some factors. How we value the things we do, things we consume, stuffs we possess, the relationships we maintain. What we inherently desire in a given point in time dictate the choices we make. But that's the half story. These choices are also dictated by the limitations we have. The salary we get from our job, the family size - people who depend on us or the people we depend on, inheritance if any, the order of the society and many more put a ceiling on our wishes. Economics take both sides of the coin in consideration. The wishes we have and the limitations imposed on us influence our economic activity. So, in short, economics is the study of choices. When we go out for shopping, we have a list of items in our wish list. Items on this wish list yield di