Why do the hunger games exist? 1 To show the president which district is the strongest?
2. To be sure the "Dark Days" are never repeated
3. To raise money for the government

If you watch the movie you will see the "special film sent all the way from the capitol) and in it it says that it is in place to prevent the "dark days" to reoccur

the food shivo was saving

a line graph will be best to show the income.