Nah, for an individual cash is an asset, but from an economy-wide perspective cash is free: the government literally prints the stuff for pennies on the hundred-dollar.

Any stable demand for cash by the general public can be accommodated without any real economic costs.

(But there are real economic costs for when that demand is changing, and the central bank don't adjust properly. Interestingly, that's mostly a problem of monopolized note issue. Free banking systems with competing note issuers adapt easier to changes in demand for notes.)