The half dollar coin fell out of circulation, after the disaster of keeping them in 40% silver, after 1964, when the quarter and dime were switched to a copper core sandwiched in a copper/nickel alloy, and the half was converted to the same alloy as the dime and quarter in 1971, and never caught back on, and the $2 Federal Reserve note was pulled out of circulation, as a Red Seal United States note, in 1966, and was introduced back into circulation in 1976 for the Bicentennial, and never caught back on.
$2 bills would cut down on the printing costs of $1 bills and halves would cut down on minting costs of quarters, and halves would save even more money if they were resized to be smaller.
The $2 bill should have the same security features as the redesigned $5 bill, such as waitermarks, a secutity thread the glows a certain color under ultraviolet light, and reads "USA 2" down the strip., and a large numeral "2" in the bottom right corner for the visually impaired. I myself, am visually impaired, and I have had cashiers complain to me that, the current $2 bill looks too much like the current $1 bill, which is confusing. Both the $1 and $2 notes should be redesigned to look fairly different from each other, and have security features to stop counterfeiters from bleaching a $1 or $2 bill, and printing a pre-1990 Series $5-$100 bill on the genuine currency paper, which would evade the counterfeit pen test.
The redesigned $2 bill should have all of the features that the current redesigned $5 bill has, such as watermarks, a security thread that glows a certain color under ultraviolet light, and reads "USA 2" down the strip, it's own color scheme, and a large numeral "2" on the bottom right corner on the reverse of the redesigned $2 bill, for the visually impaired, in the post2020 currency redesign.
All vending, coin and bill accepting machines manufactured after the year 2019, must have the ability easily be upgraded to accept future redesigns of the $2 Federal Reserve note, and either, all businesses with machines, such as vending, arcade, self checkout stands etc, must either come up with an agreement to push for a redesign of the half dollar coin to be a smaller, sided, similar to Canada's $1 Loonie coin, (but, between the size of the U.S. quarter dollar coin, and the U.S. golden one dollar coins) and perhaps a different alloy like the proposed 80% copper/20% nickel alloy proposal to cheapen the U.S. five cent nickel, or the copper/bronze alloy of the pre-1982 Lincoln one cent coins and made easily distinguishable from all other U.S. coins in circulation, by the visually impaired and the blind by looks and feel, and to fit in vending coin slots, or have all new vending machine models made after the year 2019 be made with a coin mechanism made large enough to accept the current half, in perhaps a cheaper metal composition, with the same electromagnetic signature, or in it's current composition. All machines made after 2019 should be made to accept the half in whatever size, shape or form it exists in, similar to how, all vending machines made after 1979, were made to accept and dispense the Susan B. Anthony dollar coin, and the later released, Native American and Presidential golden dollar coin series.
Retailers should automatically be supplied halves and $2 notes, and vending and self checkout machines should be equipt to accept and dispense halves, and self checkout stands should be configured to accept and dispense $2 bills as needed, as well, along with other, more common denominations and should set up cash registers 1c, 5c, 10c, 25c, and 50c, and bill slots $1, $2, $5, $10, and $20, with $50 and $100 bills going under the cash drawer, or keeping some $50 bills available under the $20 bills to make change for $100 bills.
