Panacea

/ˌpæn.əˈsiː.ə/ noun easy

A panacea is a single fix that is believed, often naively, to solve every kind of problem at once.

The mayor promised the new stadium would be a panacea for the city's economic troubles, but few economists agreed.

Memory Trick

'Pan-' means all, as in Pan-American, and '-acea' echoes cure - a panacea is a cure-all for everything.