Answer:
Farming, Merchants, Government
The Merchants will sell the crops that the farmers are freely willing to give them or Sell material that they have and do not need anymore.
The farming will be produced by Farmers, The Citizens that are will to do it.
The Government has control over the ranks, and the Country/state They can decide how much they want for profit over merchant's and they could even also decide the farmers (If they're willing to.)
The Citizens will buy the crops / materials and use/eat them.
Farmers will keep or give the crops away so they can eat/consume them.
The government has the power over the country/state and they can get food easily from merchants or make their own.
