By Nishant Shukla - Computer scientist, hacker, and author who can be found on shukla.io. Ever wonder why MP3s sell for that awkward number $1.29? There was a time when $0.99 was the norm. Throughout the years, a growing number of services, such as Google, Amazon, and Apple have taken the liberty to charge an extra 30¢ on some best selling tracks. If we were privileged with the authority to establish an increased price for the hottest tracks, we certainly wouldn't expect to charge $1.31 or $1.26; those numbers are just too random. Psychological studies indicate that prices ending with...

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