“…For instance, Kaplan and Zingales (1997;, who extensively challenged and questioned the validity of the measure of financial constraints and the positive relationship between investment and cash flow used by Fazzari et al (1988), observed that least constrained firms displayed a higher sensitivity of cash flow to investment than more financially constrained firms. This has been supported in other studies (see Chang, Tan, Wong & Zhang, 2007;Cleary, 1999;Erickson & Whited, 2000). The contradictory conclusions in empirical studies have been attributed to the lack of a precise proxy for financial constraints by Clearly, Povel and Raith (2007), whose research showed a U-shaped (nonmonotonic) relationship between investment and cash flow due to the interaction between the cost and revenue effect of investment.…”