The standard measures of effective protection calculate EPRs by reference to an activity's principal product. In many activities by-products which have a positive economic value are important. Revises the standard measures to allow for the incorporation of by-products and uses an example to...

The standard measures of effective protection calculate EPRs by reference to an activity′s principal product. In many activities by‐products which have a positive economic value are important. Revises the standard measures to allow for the incorporation of by‐products and uses an example...

Voluntary export restraints (VERs) have been widely used in recent years. VERs may be applied on a quantity or a ratio basis. A simple on‐equivalence between volume and ratio VERs is noted and potential political economy aspects are commented on.