The return on Tapping Screws suppliers the bank's equity (ROE) is the net income divided by its average equity. The return on the bank's assets (ROA) is its net income divided by its average assets. The (tier 1 or total) capital divided by the bank's risk weighted assets – a measure of the bank's capital adequacy. Most banks follow the provisions of the Basel Accord as set by the Basel Committee of Bank Supervision (also known as the G10). This could be misleading because the Accord is ill equipped to deal with risks associated with emerging markets, where default rates of 33% and more are the norm. Finally, there is the common stock to total assets ratio. But ratios are not cure-alls. Inasmuch as the quantities that comprise them can be toyed with – they can be subject to manipulation and distortion.

It is true that it is better to have high ratios than low ones. High ratios are indicative of a bank's underlying strength, reserves, and provisions and, therefore, of its ability to expand its business. A strong bank can also participate in various programs, offerings and auctions of the Central Bank or of the Ministry of Finance. The larger the share of the bank's earnings that is retained in the bank and not distributed as profits to its shareholders – the better these ratios and the bank's resilience to credit risks.Still, these ratios should be taken with more than a grain of salt. Not even the bank's profit margin (the ratio of net income to total income) or its asset utilization coefficient (the ratio of income to average assets) should be relied upon.

They could be the result of hidden subsidies by the government and management misjudgement or understatement of credit risks.To elaborate on the last two points:A bank can borrow cheap money from the Central Bank (or pay low interest to its depositors and savers) and invest it in secure government bonds, earning a much higher interest income from the bonds' coupon payments. The end result: a rise in the bank's income and profitability due to a non-productive, non-lasting arbitrage operation. Otherwise, the bank's management can understate the amounts of bad loans carried on the bank's books, thus decreasing the necessary set-asides and increasing profitability. The financial statements of banks largely reflect the management's appraisal of the business. This has proven to be a poor guide.In the main financial results page of a bank's books, special attention should be paid to provisions for the devaluation of securities and to the unrealized difference in the currency position. This is especially true if the bank is holding a major part of the assets (in the form of financial investments or of loans) and the equity is invested in securities or in foreign exchange denominated instruments.Separately, a bank can be trading for its own position (the Nostro), either as a market maker or as a trader. The profit (or loss) on securities trading has to be discounted because it is conjectural and incidental to the bank's main activities: deposit taking and loan making.Most banks deposit some of their assets with other banks.

This is normally considered to be a way of spreading the risk. But in highly volatile economies with sickly, underdeveloped financial sectors, all the institutions in the sector are likely to move in tandem (a highly correlated market). Cross deposits among banks only serve to increase the risk of the depositing bank (as the recent affair with Toko Bank in Russia and the banking crisis in South Korea have demonstrated).Further closer to the bottom line are the bank's operating expenses: salaries, depreciation, fixed or capital assets (real estate and equipment) and administrative expenses. The rule of thumb is: the higher these expenses, the weaker the bank. The great historian Toynbee once said that great civilizations collapse immediately after they bequeath to us the most impressive buildings. This is doubly true with banks. If you see a bank fervently engaged in the construction of palatial branches – stay away from it.Banks are risk arbitrageurs.