Discuss the concept of decreasing marginal substitution (MRS) using a scenario from your own life. You do not need to use two goods/products, it could also involve things such as time spent doing a hobby (you can imagine that x is the time spent doing a certain hobby, and y is time spent doing something else), for example. You can get as creative as you wish, but try your best to capture the notion of decreasing MRS in your description.