| Zero economic profit | A rate of profit equal to the opportunity cost of capital. See also: normal profits, opportunity cost of capital. |
| Zero lower bound | This refers to the fact that the nominal interest rate cannot be negative, thus setting a floor on the nominal interest rate that can be set by the central bank at zero. See also: quantitative easing. |
| Zero sum game | A game in which the payoff gains and losses of the individuals sum to zero, for all combinations of strategies they might pursue. |
| Zombie funds | More formally these are called closed funds. It’s a name given to a closed with-profits fund that no longer accepts new business until the existing policies mature. |
