You certainly dont need a PhD to say that the prosperity of Kerala is mainly due to the Inward remittance from NRKs. The Govts of Congress or Communists have nothing to do with this. Their contribution if at all is only destructive in nature.
Sheer consumerism has driven the growth of the state. With not many Industries and a failing Agrarian society only Money orders is sustaining the economy. As long as a George in California or a Kurup in France will always think of owning an Estate in Munnar or North Kerala and keeps remitting and that propels the so called growth in the Malluland.