+<p>
+
+Formally, the capacity is a list of terms, all but the first preceded
+by one of <kbd>-</kbd>, <kbd>minus</kbd>, <kbd>+</kbd>,
+<kbd>plus</kbd>. Each term may specify a mass and/or a volume
+(separated by a space), as a number followed (without an intervening
+space) by a unit (<kbd>t</kbd>, <kbd>kg</kbd>, <kbd>kl</kbd> or
+<kbd>l</kbd>). Alternatively each term except the first may specify a
+percentage, which is applied as a percentage change to the answer from
+all the preceding terms. The first term may be a ship name or
+abbrevation instead. If the first term specifies only one of mass or
+volume, all the subsequent terms may only adjust that same value.
+
+<h3><a name="losses">Expected losses</a></h3>
+
+In theory if you were guaranteed to have a trouble-free voyage it
+would be worth trading goods at very low margins. However, in
+practice problems can arise: you may be attacked and lose your stock,
+or market conditions may change between your collection and delivery
+of the goods.