Let's say a portal to an alien dimension opens in the UN general assembly hall. The Sneedobites offer Earthlings a pact - any goods or services produced in excess of yesteryear output's value will be siphoned off into their realm. On the other hand all the resources that had been harvested by humans will be replenished, regardless of our economic performance.

Would the world's-economy-as-we-know-it be capable of enduring such conditions? What would the effect on wages, living conditions of the masses, political dynamics etc. be?