In the US, the largest coin in (general) circulation remains the quarter (about 12p!). Is there any demand amongst Americans for more 'sensible' coins like a dollar, 2 dollar, 5 dollar etc to be minted and put in general circulation, and, if not (as I suspect) why not?

Paul Street, Leeds

• the largest coin is actually the silver $1 bullion at 40.6 mm diameter.

  B. Romans, Seattle USA

• Like most people in the USA I rarely use cash. The exception is giving tips, something I need to do once or more each day. Giving notes is more satisfying - to both parties - than giving coins. This, I suspect, is a small part of the answer.

  Paul, Houston, USA