"Ten of thousands of people place their extra change into a jar or bank
every night when they return home thinking that they are saving money.
In reality, the dynamics of saving coins has changed over the last 10
years so that by placing your extra coins in a jar, you may actually be
losing money."
Quoted from The Money Jar Trap
I disagree with the author but then I am not paying any money or losing any by saving my coins. How about you?