new york warren buffett bemoan negative drumbeat u.s. economy presidential candidates annual berkshire hathaway inc shareholder letter saturday say mislead americans believe children bad election year candidates stop speak country problems course solve buffett write italicize emphasis result dour outlook u.s. economy many americans believe children live prosperously 85-year-old buffett say view dead wrong baby bear america today lucky crop history buffett say buffett single presidential candidates name billionaire december officially throw back behind hillary clinton democrat presidential elections incumbent run side run president always say ones solve nation problems point problems say bill smead invest 2.1 billion smead capital management seattle republican presidential candidate donald trump new jersey gov chris christie endorsement friday offer bleak assessment u.s. economy repeatedly say bubble hop pop take office want inherit stuff say letter buffett say commentators bemoan current percent per year growth real gross domestic product yes would like see high rate say america population grow 0.8 percent per year percent gdp growth equate 1.2 percent per capita growth rate may sound impressive buffett say single generation say 25 years rate growth lead gain 34.4 percent real gdp per capita buffett whose home omaha nebraska sit less acre say society advance significantly since grow great depression families upper middle-class neighborhood regularly enjoy live standard good achieve john d. rockefeller sr. time birth say unparalleled fortune buy take grant whether field name transportation entertainment communication medical service rockefeller certainly power fame could however live well neighbor do tell buffett say good idea listen presidential candidates negative outlooks 240 years terrible mistake bet america time start say america golden goose commerce innovation continue lay large egg america social security promise honor perhaps make generous yes america kid live far good parent do report jennifer ablan jonathan stempel edit nick zieminski article fund part sap independently create reuters editorial staff sap editorial involvement creation production buffett rail presidential candidates talk economy