„Quantitative Restrictions“

Explicit limits, or quotas, on the physical amounts of particular commodities that can be imported or exported during a specified time period, usually measured by volume but sometimes by value. The quota may be applied on a selective basis, with varying limits set according to the country of origin or destination, or on a quantitative global basis that only specifies the total limit and thus tends to benefit more efficient suppliers.

Source:

Krugman, P. R., Obstfeld, M., Melitz, M. J. (2015). International Economics: Theory and Policy. 10th ed. Pearson.