Many believe the work should be financed by the 'public purse'. [=should be paid for by the government]
Companies are expected to 'loosen the purse strings' as the economy improves.
School administrators are already 'tightening (the) purse strings'.
(..) We're taking the bus, nitwit! There is a bus leaving tomorrow, perfect. A ticket cost money. How do we get money? - Mom's purse. - Oh. You wouldn't. Oh, but I would. Where was it we saw it last? - No! - Aw! (..)2015 Inside Out