When onion price hits hard, the poor man simply stops buying it. Which one of these is the correct explanation for this?
A rupee spent on buying onions does not yield rupee worth of satisfaction
A consumer buys a commodity only when a rupee spent on it yields rupee worth of satisfaction (MUM). A poor man stops the consumption of onion when he finds that a rupee spent on it does not yield rupee worth of satisfaction (no matter what quantity of onions is purchased), so that, MUx/PX=MUM