Inferences drawn from tests of market efficiency are rendered imprecise in the presence of infrequent trading. As the observed index in thinly traded markets may not represent the true underlying index value, there is a systematic bias toward rejecting the efficient market hypothesis. For the three emerging Gulf markets examined in this paper, correction for infrequent trading significantly alters the results of market efficiency and random walk tests. The BeveridgeNelson (1981) decomposition of index returns is done to estimate the underlying index.

Reviews previous research on the factors affecting the proportions of debt and equity used to finance firms, describes the Saudi Arabian tax system (based on net worth) and stock market; and examines the capital structure 1993‐1997 of a sample of 35 publicly traded Saudi companies. Uses multi‐linear regression models to investigate the relationships between capital structure and other variables in 5 sectors and illustrates their varied leverage ratios. Discusses and analyses the positive links between leverage ratios, firm size and share of government ownership; and negative links with growth, return on assets and profitability margin.

Explains how the adoption of Islamic law (Shariah) theoretically affects a political economy, why it requires the abolition of interest rates as a price for money and how this is achieved. Takes Saudi Arabia as an example of a Muslim country governed by Shariah and investigates how far it accords with theory. Argues that equity financing (including non‐interest bearing government bonds) has helped to finance growth and insulated the stock market from speculative financing. Looks at statistics on the financial structures, assets and loans of Saudi banks (including joing ventures with foreign banks) and concludes that they have “done well” in implementing Islamic principles; and that interest‐free financing is appropriate for this country.

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