(Bloomberg) -- Westpac Banking Corp.’s Bill Evans will switch out of the chief economist role he has held for more than 30 years and be replaced by Reserve Bank Assistant Governor Luci Ellis, in a significant change for both institutions.Most Read from BloombergYellen Says US-China Ties on ‘Surer Footing’ After Beijing VisitPowell Haunted by Repo Crisis as Fed Aims to Cut Balance SheetJack Ma’s Clash With Beijing Costs Ant, Alibaba $850 BillionChina’s Flood of Plastic, Yellen Departs: Sunday Asi