The motivation for this contribution has undoubtedly been rather missionary, because there are two possible reasons why spatial econometric methods have not been more widely adopted in economics, and particularly in the very relevant areas of trade and location, supposing that researchers are concerned to test their hypotheses on empirical data. The first, which is not improbable, is that the methods are not yet adequate, but here one can see economists, like Pace, Pinkse, Dubin, or Case, contributing with new variants or increments to the existing body of work. Indeed, economists tend to be very welcome to publish in the key journals in the field, such as Environment and Planning A, Geographical Analysis, or Regional Science and Urban Economics. The second is that we have not done a very good marketing job, and although this paper is not going to impress my colleagues specialising in that ``black art'', I hope that it may increase curiosity, and that the lengthy list of references can give that curiosity something to feed on. Nonetheless, caveat emptor.