#30. Local Adaptation.# Lastly, the division of labour allows of local adaptation--that is, it allows every kind of work to be done in the place most suitable for it. We have already learnt (sec. 22, p. 29) that each kind of labour should be carried on where it is most productive; but this cannot be done unless there be division of labour--so that while the French grow wine, weave silk, or make _articles de Paris_, they buy the cottons of Manchester, the beer of Burton-on-Trent, or the coals of Newcastle. When trade is free, and the division of labour is perfect, each town or district learns to make some commodity better than other places: watches are made in Clerkenwell; steel pens in Birmingham; needles at Redditch; cutlery at Sheffield; pottery at Stoke; ribbons at Coventry; glass at St. Helen's; straw bonnets at Luton; and so forth. It is not always possible to say exactly why certain goods are made better in one place--for instance, silks in Lyons--than anywhere else; but so it often is, and people should be left as free as possible to buy the goods they like best. Commodities are manufactured in order that they may produce pleasure and be useful, not, as we shall see, in order that labourers may be kept hard at work. Now, when trade is left free it gives rise to division of labour, not only between town and town, county and county, but between the most distant nations of the earth. Thus is created what may be called #the territorial division of labour#. Commerce between nation and nation is not only one of the best means of increasing wealth and saving labour, but it brings us nearer to the time when all nations will live in harmony, as if they were but one nation.