WPP's media investment group, GroupM, updated its 2018 and 2019 ad investment forecasts to reflect a downgrade in both. In its biannual This Year, Next Year report, GroupM downgraded 2018 growth expectations from 4.5 percent to 4.3 percent and 2019 expectations from 3.9 percent to 3.6 percent. Total new investment is expected to reach $19...
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