Final answer:
Specialization requires trade so that workers do not only consume what they produce.
Step-by-step explanation:
Specialization requires trade in order to ensure that workers do not only consume what they produce. When workers specialize in a particular job, they receive payment for their work, which they can then use to purchase other goods and services that they need. This promotes trade and allows workers to access a wider range of goods and services beyond what they produce themselves.