What ethical responsibilities do individual consumers have when dealing with companies that rely on overseas labor?

What ethical responsibilities do individual consumers have when dealing with companies that rely on overseas labor?
Should businesses adopt universal workplace standards about working conditions and employee protections? Why or why not?
What would be required for consumers to have the necessary knowledge about a product and how it was made so that they could make an informed and ethical decisin? The media? Commercial watchdog groups? Social-issues campaigns? Something else?

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