1. To study the effects of government spending on economic growth, inequality and population density via a model of endogenous growth. 2. Empirically analyze the above results via numerical simulation using Thailand data. Such results will include 2.1 Comparison of the effect of government spending for Bangkok and its vicinity and the rest of Thailand. 2.2 Calibration for the optimal allocation of government spending for Bangkok and its vicinity and the rest of Thailand. 3.Derive relevant initial policy implication: How effective is the current allocation of government speding on economic growth, inequality and population density. How government spending should be allocated between Bangkok and its vicinity and the rest of Thailand.