Mais fácil simplesmente deixar Katniss explicar isso.
Um breve histórico sobre os Jogos Vorazes:
The Treaty of Treason gave us the new laws to guarantee peace and, as our yearly reminder that the Dark Days must never be repeated, it gave us the Hunger Games. The rules of the Hunger Games are simple. In punishment for the uprising, each of the twelve districts must provide one girl and one boy, called tributes, to participate.
Sobre a elegibilidade e o número de vezes que seu nome está no conjunto a ser retirado:
You become eligible for the reaping the day you turn twelve. That year, your name is entered once. At thirteen, twice. And so on and so on until you reach the age of eighteen, the final year of eligibility, when your name goes into the pool seven times. That’s true for every citizen in all twelve districts in the entire country of Panem.
But here’s the catch. Say you are poor and starving as we were. You can opt to add your name more times in exchange for tesserae. Each tessera is worth a meager year’s supply of grain and oil for one person. You may do this for each of your family members as well. So, at the age of twelve, I had my name entered four times. Once, because I had to, and three times for tesserae for grain and oil for myself, Prim, and my mother. In fact, every year I have needed to do this. And the entries are cumulative. So now, at the age of sixteen, my name will be in the reaping twenty times.
The Hunger Games - Chapter One
E no voluntariado:
“I volunteer!” I gasp. “I volunteer as tribute!”
There’s some confusion on the stage. District 12 hasn’t had a volunteer in decades and the protocol has become rusty. The rule is that once a tribute’s name has been pulled from the ball, another eligible boy, if a boy’s name has been read, or girl, if a girl’s name has been read, can step forward to take his or her place.
The Hunger Games - Chapter Two
Além disso, quando alguém se voluntariar, nada poderá ser feito para desfazer essa ação. Não é mencionado como Panem aborda o caso de vários voluntários do mesmo sexo.