washington obama administration plan set federal borrow sustainable path rely strong economic growth see big government agencies turn low expectations administration view lay tuesday annual budget proposal gross domestic product grow 2.3 percent year long run median policymaker federal reserve however see long-term growth percent rate see non-partisan congressional budget office differences modest show white house economists slow downgrade view america growth potential feed cbo cut view long-term growth recent years white house hold steady budget submit since early 2013. period cbo cut view 2.2 percent view core feed policymakers go 2.3-2.5 percent range 1.8-2.2 percent range impossible make full apples-to-apples comparison administration view feed cbo administration projections base assumption budget fully enact unlikely happen propose immigration law change would make workforce young productive infrastructure investments would also boost efficiency administration say budget prominent academics include former treasury secretary lawrence summer northwestern university economist robert gordon warn u.s. growth may shift persistently low recent decades strong growth view allow white house project national debt stay around 75 percent gdp 2026. cbo comparison see debt upward path period hit 86 percent 2026. white house economists acknowledge slow growth would put pressure budget say tuesday proposal percentage point slowdown gdp growth would add 3.1 trillion deficit decade 2026. budget also assume modest pace health care inflation ease strain budget create age society argue propose investments immigration reform help productivity growth proposal note slow productivity growth high health care cost could result debt explosion debt-to-gdp reach 500 percent around 2090 white house debt path view tie optimistic growth forecast