单项选择题

A．To demonstrate the importance of public health laws.
B．To point out that without luck businesses will not succeed.
C．To explain how traveling led to new inventions.
D．To illustrate the importance of having the right product at the right time.
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S5. The neoclassical model is basically a model of the first stage, because at this stage the family could rely either on ___________.
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S3. During the second stage, if the family wanted to consume new goods ’and services, they had to enter the marketplace_______.
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