liquidity

Hmm I thought real GPB is only ever affected by technology, labour force and capital (Side note: now that technology boomed in 20001, capital in 2007 and labour force being in decline since the baby boomers I sometimes get frighted about budget deficits incurred by entitlement .
Spending only moves aggregate demand, therefore only nominal GDP is affected. AFAIK, entitlement is what thommo has described, all government sponsored welfare spending.