There's a note below the second chart. They're talking about the value of producing these over a period of time. Coins last much longer, 25 years compared to 6

There's a note below the second chart. They're talking about the value of producing these over a period of time. Coins last much longer, 25 years compared to 6 years for a dollar bill. So, how much do they really cost in the long run is what showing in the second chart. Basically, despite the fact that bills last 6 years, it's still cheaper to replace them.