increase expenditure, generally, leads to GDP growth, this can be refered to multipliers effect. multiplier effect can be defined as an increase in the expenditure, leads to an increase in SRAD (short run aggregate demand), therefore, leads to a greater increase in the amount of economic growth, eg. GDP growth.
increase expenditure, however, inflation will occur as well as the GDP growth. in order to offset the impact of inflatioin that caused by increasing expenditure, government should use supply-side policies to stimulate SRAS (short run aggregate supply) to achieve stable economic growth, the policy like decrease price of raw materials, training labour to increase efficiency, increase numbers of labour in the market, etc can increase SRAS curve to offset the effect.