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Commerce in the physical world is called marketplace, while commerce in the information world is called ____________________.
___________ is an attachment to an e-mail message or program embedded in a Web page that verifies that the sender or Web site is who it claims to be.
A computer must have a(n) ____________________ to run programs.
____________________ valuations are amounts that bidders are willing to pay for an item.
In general, the creation of a separate experience for customers based on their behavior is called ____________________.
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