If rules of fiscal sustainability are observed, available fiscal space permits effective countercyclical fiscal programs. The importance of automatic fiscal stabilizers should not be underestimated. The discretionary impact of increased public spending and tax cuts can be amplified if implemented when consumer confidence investor sentiments are high. There is no evidence to support non-Keynesian effects of fiscal policy in Thailand. Unwarranted fears of unsustainable public debt and ultra-conservative fiscal policy has cost the country a lost opportunity for achieving high growth. After the military coups in 2006 and 2014, the Thai economy experienced the lowest economic growth among ASEAN countries. The budget spent on economic services was diverted into defense, increases in public sector's wages, and income transfer payments. The opportunistic political budget model predicts higher fiscal spending by incumbent democratic governments before an election to gain votes. In the case of Thailand, such spending comes after military coups, akin to a military business cycle spending.