As the most influential emerging and developing country in Asia, China has attached great importance to the construction of infrastructural facilities, laying stress on its pivotal role in sustainable growth. Recently, however, a pessimistic mood about the term “consumption downgrade” continues to emerge, ascribing the dip in people’s disposable income to real estate bubbles stemming from too much government infrastructure spending. This paper collects empirical evidence, develops a Dynamic Stochastic General Equilibrium (DSGE) framework, regards Productive Government Expenditure (PGE) as a critical endogenous variable, and investigates thoroughly its overall effects on key indicators concerning economic growth and sustainable development. Results show that household consumption indeed responds directly and negatively confronting a sudden increase of public infrastructure investment in China, yet aggregate output is instead boosted. On top of that, productive capacity does not present a supposed reduction, but a promotion under the PGE shock. These findings indicate that so-called “consumption downgrade” delivers the wrong message of weak productivity; capacity utilization is in essence improved by vigorous government support for infrastructure construction, which ultimately benefits continuously-stable social sustainability in the long term.

Recently, China has witnessed a continuously increasing Debt-to-GDP ratio and a vigorously expanding shadow banking sector. Housing prices hovering at a high level seriously affect the lives of ordinary residents. Disappointingly, a variety of activities such as intense deleveraging campaigns and tight monetary controls produce little effect. Why do these seemingly rightful implementations hardly work? What should governments do to stop the incessant expansion of asset bubbles? What role ought financial supervisors to play in regulating credit markets and facilitating a sustainable and inclusive economic growth? This paper sets off from the pledgeability of asset bubbles and constructs a generalized overlapping generation (OLG) model incorporating financial frictions and collateral constraints, in order to explore the bubble evolution under the alterations of market interest rates and credit conditions. The results show a unique bubble equilibrium, in which the steady-state bubble size expands when interest rate increases. Numerical results further reveal that the bubble-inflation effect of a higher interest rate is reinforced by a more stringent collateral constraint. Our research contributes to an explanation of the inefficacy of present policies and provides the following policy implications: The combination of an interest rate elevation and a strong loan restriction is in fact undesirable for suppressing asset bubbles. Not merely does it strike productivity and capital formation, but it also fosters investors to hold more risky assets to solve liquidity shortage under constrained borrowing capacity.