Evidently the Munchkins were good farmers and able to raise large crops.

Once in a while she would pass a house, and the people came out to look at her and bow low as she went by; for everyone knew she had been the means of destroying the Wicked Witch and setting them free from bondage.

The houses of the Munchkins were odd-looking dwellings, for each was round, with a big dome for a roof.
All were painted blue, for in this country of the East blue was the favorite color.
Toward evening, when Dorothy was tired with her long walk and began to wonder where she should pass the night, she came to a house rather larger than the rest.

On the green lawn before it many men and women were dancing.

Five little fiddlers played as loudly as possible, and the people were laughing and singing, while a big table near by was loaded with delicious fruits and nuts, pies and cakes, and many other good things to eat.
The people greeted Dorothy kindly, and invited her to supper and to pass the night with them; for this was the home of one of the richest Munchkins in the land, and his friends were gathered with him to celebrate their freedom from the bondage of the Wicked Witch.
Dorothy ate a hearty supper and was waited upon by the rich Munchkin himself, whose name was Boq.