They may also be described as redundant, cascading, or compound, in which case they have a specific and an ad valorem component.
The so-called Concertina Rule deals with these, and they are the focus of the Metzler Paradox. They may be described as scientific if they are made-to- measure, and a Harberger Triangle may be used to measure their net welfare loss. They may also be described as redundant, cascading, or compound, in which case they have a specific and an ad valorem component. Created by conversion from NTBs, actual examples of them include the Dingley one, the Wilson-Gorman, the Fordney-McCumber, and the Hawley-Smoot one. FTP, name this economic term defined as a tax on trade.
The so-called Concertina Rule deals with these, and they are the focus of the Metzler Paradox.
{tariff}s (prompt on duty or tax)