Mobile payment sales will reach $1 billion this year, according to eMarketer, half of a projection the group issued in October 2012. While growth tripled last year, eMarketer cited a "congested landscape" in issuing a more pessimistic outlook for the next several years. But eMarketer did predict that mobile payments will eventually catch on, growing from $20 billion in 2016 to $58 billion the following year.

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