INTERTEMPORAL OPTIMIZING MODELS OF TRADE AND CURRENT ACCOUNT BALANCE: A SURVEY

Abstract.  This study surveys the intertemporal optimizing models of trade and current account balance that were developed, calibrated and empirically tested since they came into vogue in the 1980s. The implications of these models often differ from those of static and dynamic conventional non-optimizing models. The literature on optimizing models has not only grown reasonably fast, but has also witnessed significant advances in methodology, and these models have culminated into a distinct strand of new open-economy macroeconomics. The studies conducted until the late 1980s have used deterministic perfect-foresight models, while several studies conducted since the 1990s relax the perfect-foresight and certainty equivalence assumptions and develop stochastic dynamic general equilibrium models to account for uncertainty confronting the optimizing agents. The future research needs to explore the possibility of tracing any preferred specification of household preferences, model the effect of time-varying discount factor on household utility function and intertemporal budget constraint, examine the role of costs in international trade, place a parallel emphasis on the empirical verifications of theoretical propositions, examine the relative performance of optimizing vis-à-vis non-optimizing models and rationalize the extreme propositions of perfect and imperfect capital mobility in the wake of moderately open capital accounts.     

Consumption-smoothing in a small, cyclically volatile open economy: Evidence from New Zealand

New Zealand's current account of the balance of payments has been persistently in deficit since the early 1970s and increased markedly during the late 1990s. Should this cause significant concern, for such a small, cyclically volatile open economy? Our results show that VAR1 and VAR2 forms of the traditional intertemporal consumption-smoothing model reflect very satisfactorily the volatile directions and turning points observed, that the data are not consistent with consumption-tilting to the present, and that New Zealand has had considerable success to date in consumption-smoothing around its average 5% current account deficit. Perhaps more unexpectedly, a Bergin–Sheffrin-type model of a small open economy with variable interest rates and exchange rates has not performed noticeably better.     

Malaysia’s current account deficits: an intertemporal optimization perspective

The study examines the account imbalances in Malaysia during the past four decades. Using Sachs’s (National Bureau of Economic Research, Working Paper No. 859, 1982) intertemporal model, we address the issue of external solvency by measuring the deviation of actual from the optimal path of the current account balance. All in all, we found that the actual path moves reasonably close to the estimated consumption-smooth currents accounts, suggesting that the current account balances satisfy the external solvency condition. The major findings from the empirical application of the model revealed the following: (i) the deficits of the 1990s prior to 1997 financial crisis were sustainable; (ii) the evidence appears to suggest that the current account balance broadly follows the same pattern of the intertemporal model and hence suggests that capital is mobile; (iii) the large surpluses observed during the post-1997 period significantly deviate from the optimal path, implying that consumption is unsustainable and is expected to fall in the near future and; (iv) there is excessive volatility in international capital movements for consumption-smoothing purpose.