They can achieve some efficiencies by "freeloading" that bigger countries cannot match, for example Switzerland doesn't train enough doctors at their own universities but relies heavily on hiring doctors from Germany.
How is this "freeloading"? Medical schools located in Germany train doctors, who then pay the medical school. People in Switzerland pay the doctors for services.
Is Germany also freeloading on Switzerland if they purchase Swiss chocolates or watches? Is the US freeloading off India because the US buys BPO services from India?