"Eliminate social security and medicare" is not a realistic endeavor. They are extremely popular and beneficial programs for the population. If you want to discuss the economic gain from stopping the programs, you must also consider the drastic negative impact on the people in general, which will necessarily have related impacts on the economy. Drop the nickel for a half-dime? Why? Going from quarters to fifths would be a hard sell to Americans. What benefit is there to this? Why just one decimal, why not two? It's just numbers. in sum: And in the end, all of these discussions are missing the reality that electronic transactions will be the norm and it won't matter about rounding to 5c or moving decimal points around, or how many coins there are.