The inference is that Sir Thomas More claims that the best society is one in which all people work at useful occupations.
It should be noted that an inference simply means the conclusion that can be deduced based on the information given.
From the excerpt, it was stated that number of those by whose labours mankind is supplied is much less than you perhaps imagined: then consider how few of those that work are employed in labours that are of real service, for we, who measure all things by money, give rise to many trades that are both vain and superfluous, and serve only to support riot and luxury.
This was important to support the claim that claims that the best society is one in which all people work at useful occupations. This can help the growth and development of the country.
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