I have been more than a tad concerned about near-paralysis in the money markets and imploding equity prices. But this e-mail, from a well connected international investor not prone to alarm or (normally) the use of capital letters says that the banking crisis is staring to bring international shipping to a halt.

By way of background, letters of credit of various sorts are essential for trade. For instance, imagine the difficulty if you are, say, a Chinese manufacturer who wants to sell his wares to buyers overseas. How can he be sure the goods he ships will ever be paid for? Imagine the considerable difficulty and cost of chasing a deadbeat in a foreign country. Letters of credit. issued by banks, assure payment. They can also serve to finance the shipment (ie, fund the inventory while it is in transit).

Not only are banks now leery of lending to each other for much longer than overnight, they are also starting to refuse to honor letters of credit from …