Question

Why did the Roman Empire produce more coins?

to maintain a low rate of inflation
to increase individual buying power
to address a high rate of inflation
to fund the government and the military

Answer 1

to fund the government and the military

The Roman state increased coin production mainly to pay soldiers, civil servants, and public expenses. Minting more coins was a way to raise funds for government and military needs (and often led to debasement and inflation, not higher individual buying power).