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@Lemming
From what I am reading there, its not the death penalty that costs money, but all the lawyers trying to prevent it and turn it into life sentence is what costs money. Plus, choosing a 70,000$ lethal injection instead of a 3$ bullet might have had an impact too.
The cost of just having a prisoner in prison is:
"States spent an average of $45,771 per prisoner for the year."
In 10 years, that is 450k. In 20 years, that is 900k. In 40 years, thats 1.8 million. In 60 years, that is 2.7 million dollars.
When we add to that the cost of trial, which is about 100,000, we get 2.8 million.
Therefore, death penalty is better. Just set a time limit for trial so that the trial cannot last for 20 years, and choose bullets over injection, and remove the option that death penalty can be turned into life sentence and it will be fixed. The price will be "trial + bullets".