What effects did napoleon intend the sale of louisiana to have on france, the united states, and britain?

Napoleon hoped that he would gain money to finance his wars particularly in Europe. The funds obtained would help him finance wars in addition to punish the British as the  sale would  forever assure the power of the United States

the cost of food and other items skyrocketed

Explanation:

During the Civil War between the North and the South, the economy of the North was not having its best moments. The main reason for this was that it was spending lot of money on the war, the military, in order to be able to win against the South. Also, lot of men were engaged into the war, so there was a lack of workers in certain sectors for some time. This led to lack of some products on the market, but also in a quickly rising inflation. The inflation led to the cost of living to skyrocket, and the prices of the food were especially affected by it as they increased by a lot, leaving lot of people on the verge of existence for some time.