Employment agencies, career fairs, and internet ads can all be sources of

   Job leads

Explanation:  All of the above options, i.e. sources, are sources of of job leads. Whether it is official information from employment agencies, career fairs, online ads, all this represents job leads for potential job. Each job lead corresponds to some of the abilities that are needed at that moment, so there is always the opportunity to find a job by following job postings and employment agencies official information.

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explanation:

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international economic development agencies harm poorer nations by encouraging them to serve as exporters to wealthier nations.