The costs of acquiring new users for mobile apps reached an all-time high in December as well-heeled companies scrambled for mobile market share over the holidays, according to a report by mobile marketing firm Fiksu.
The Fiksu Index published today shows that the cost to acquire a loyal user (one who opens an app three times or more) was $4.23 in December, up 19 percent from November and up 101 percent from December 2014. The all-time record beat out the previous record of $4.14 in September.

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