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The paper examines the differential effect of liquidity constraints on corporate growth using unbalanced panel data for 457 Pakistani firms over the period 2010–2017.

The study uses the probability of a financial unconstrained index constructed by estimating the endogenous regression model. This approach provides a time-varying measure of financial position for all firm-year observations and takes into account the different degrees of liquidity constraints that a company faces in attaining funds from external markets. It is derived from a multivariate selection equation that simultaneously accounts for all-important features of the underlying company identified in the literature. The cash flow variable has then interacted with various groups of dummy variables for financial constraint, which allows the coefficient of cash flow to vary across firm-year observations in the different liquidity constraint categories. The two-step system-GMM estimator is applied to estimate the main empirical model.

The results of the study provide evidence of the heterogeneity in firms' growth sensitivity to internal funds, depending on the degree of liquidity constraints. Financing growth through internal funds is found to be essential for both liquidity unconstrained and constrained corporates. However, it is observed that the coefficient of cash flow is greater for firms that do not have access to external financing and it eventually decreases with reductions in the magnitude of liquidity constraints, making the least constrained corporates' growth less responsive to internal funds. The results further indicate that smaller and younger firms show higher responsiveness of growth to internal funds. This finding is mainly attributed to financial market imperfections that make external funding difficult for them.

The results suggest that financially constrained firms should expand their corporate size more than the magnitude of positive income shocks they encounter. The study also suggests important policy implications for liquidity-constrained firms to carefully concentrate on their financing strategies to enhance their growth. By improving the corporate's capacity for production, corporates can achieve a faster effect of a potential positive income shock on their growth.

This paper contributes to the literature by constructing a financial constraint index by running the endogenous regression model. It also contributes by investigating the differential impact of credit constraints on firms' growth in Pakistan and how corporate size and age affect firm growth when financial constraints and investment opportunities are controlled.