Layoffs and furloughs hit holding companies WPP, Omnicom, IPG, and MDC Partners as advertisers slash spending

· Furloughs and layoffs have begun to hit all the major ad holding companies as the coronavirus pandemic has ground the economy to a halt and led advertisers to cut spending.
· MDC Partners' CPB, Omnicom's DDB and BBDO, and WPP's Grey were among the creative agencies affected.
· Omnicom Media Group leadership recently...