Flat tax renews fight on ‘trickle-down economics’

WASHINGTON (AP) — The flat tax is mak­ing a come­back among Repub­li­can pres­i­den­tial can­di­dates. But it faces tough oppo­si­tion in Con­gress because it tends to favor the rich at the expense of other tax­pay­ers, renew­ing an old debate about ‘trickle-down economics.’