A leader can fix the value of certain goods and services. Leaders basically get to decide how much everything is worth in value, like rice or lamps or how much you get paid for the work you do.
This leader has fixed the value of cheese (ち), making it ￥1 permanently. One yen! That's, like, less than a penny! Unfortunately, the leader won't fix any of the other really expensive things... so now everyone only eats cheese.