Via @adjustcom, @liftoffmobile data, cost of acquiring a #retail #mobile #app user who made a 1st purchase globally -50.6% Y/Y, in US -75.2% Y/Y. #digitalmarketing #ecommerce #mcommerce #retail #retailmarketing #mobilemarketing $FB $GOOG $WMT $TGT $BBY $M $KSS $JCP $AMZN $KR