In thus forcing all the export trade of the country through one narrow channel the first purpose of the State was merely to provide a convenient method of gathering customs into the Exchequer; and in course of time it further discovered that this trading system might be used as a weapon against foreign peoples in case of quarrel. But the very last object of the Staple organization was the convenience of the traders. Nor had the merchants themselves any illusions in this respect. To them the Staple seemed at its beginning contrary to the liberties of Magna Charta;[51] and a long experience taught them how its provisions might keep them shut in between the rapacity of those in authority and the hatred of the farmers who produced the wool which they sold.[52] They could however still wring a rich advantage out of superficial calamity—the advantage to be found in monopoly and corporate privilege—and this was developed with consummate art. The wool trade gathered into their hands was hedged round with monopolies and regulations, protected by fixed prices and times of sale. The concourse of customers at Calais was diligently maintained; no buyer was allowed to order his work through a commission house, so that traders might be forced to come to the market in person and do their business. By the charter of Edward the Third a Mayor and twenty-four Aldermen chosen by the whole body of merchants absolutely ruled the Staple trade, appointed officers, supervised markets, made regulations as to the treatment of foreigners, the duties of innkeepers, or the general conduct of business, and administered justice according to the Law Merchant with a sworn jury of foreigners or English or both together, according to the case to be tried.[53] And since the governing body had general control beyond Calais itself over all English merchants, not only in Bruges but throughout Flanders, while they governed in England through their local officers, the power of the Staple extended far and wide and brought all the scattered merchants under one general organization.[54] Formidable through their wealth and power, they could command the support of English kings and Burgundian dukes against rival traders. The profits to be made at Calais tempted the landowners at home,[55] and all who were wealthy enough to pay the required dues and fees flocked into their body, till the great association at last included all rich wool-growers and shut out only the poor farmers and people of no account in the country. Their monopoly was so complete, and their discipline so effective, that they could absolutely dictate prices; and a judicious pooling system took away any temptation on the part of the members to break the ranks.[56] At last against the original intentions of legislators they even got into their own hands the carrying of the export trade, and so long as wool remained the chief export of England 80 per cent. of this trade passed through their hands.