Doesn't affect your commerce at all.
It depends on where you live.
What happens if most of the border towns started accepting only pesos because they are so close to the border why not make it easier for illegals?
Americans in their own country would then have to convert their currency for use in the US.
Then the only language spoken is Spanish because it is easier for the Mexicans.
Next thing is the border disappears because it is easier for the Mexicans.
It can't happen here you say. Well it is happenning. Just slowly.
...all United States money ... are a valid and legal offer of payment for debts when tendered to a creditor. There is, however, no Federal statute mandating that a private business, a person or an organization must accept currency or coins as for payment for goods and/or services. Private businesses are free to develop their own policies on whether or not to accept cash unless there is a State law which says otherwise. For example, a bus line may prohibit payment of fares in pennies or dollar bills. In addition, movie theaters, convenience stores and gas stations may refuse to accept large denomination currency (usually notes above $20) as a matter of policy.
The above is from the US Treasury.