There are several French territories which request1 independence: Corsica, New Caledonia, Guiana (among others).
Putting aside the actual backing of the majority of local population (which these independentist movements usually do not have), can they survive economically on their own?
I was under the impression that they could not. On the other hand Corsica is similar to Malta or Cyprus which do well. It also has ~3.6 MM EUR of subventions, vs. the ~3 MM EUR they pay back to France. So maybe.
New Caledonia on the other hand is dependent on continental France (16% of its GDP comes from subventions) so left on its own it would probably sink into an economic disaster.
Are there some general rules on sustainability of such ex-colonial small territories, if they gain independence?
1 at least some vocal groups in these territories