** Jefferies cuts ratings for European business and employment services firms, citing incremental structural challenges
** The broker double downgrades Randstad RAND.AS to "underperform" and cuts Adecco ADEN.S and Hays HAYS.L to "underperform" from "hold"
** The companies' shares fall 4% to 7% by 0855 GMT
** "This time is different," Jefferies says, as it sees the sector's troubles moving to structural challenges from cyclical struggles
** Jefferies says it expects both Randstad and Hays to face another year of earnings decline
** Hays is the most at risk structurally and also has further dividend risk in 2026, Jefferies says
** The broker says short-term positive momentum from restructuring is priced in for Adecco, with risk coming from underlying weakness
(Reporting by Bernadette Hogg)
((bernadette.hogg@thomsonreuters.com))