As a price for assisting the Ottomans in expelling Mehmet Ali from Syria, the British insisted that the sultan sign the 1838 Treaty of Balta Liman. By lowering duties and abolishing monopolies in Ottoman territories, the treaty opened up the Ottoman Empire to British free trade policy.
Art. I. All rights, privileges, and immunities which have been conferred on the subjects or ships of Great Britain by the existing Capitulations and Treaties, are confirmed now and for ever, except in as far as they may be specifically altered by the present Convention: and it is moreover expressly stipulated, that all rights, privileges, or immunities which the Sublime Porte now grants, or may hereafter grant, to the ships and subjects of any other foreign Power, or which may suffer the ships and subjects of any other foreign Power to enjoy, shall be equally granted to, and exercised and enjoyed by, the subjects and ships of Great Britain.
Art. II. The subjects of Her Britannic Majesty, or their agents, shall be permitted to purchase at all places in the Ottoman Dominions (whether for the purposes of internal trade or exportation) all articles, without any exception whatsoever, the produce, growth, or manufacture of the said Dominions; and the Sublime Porte formally engages to abolish all monopolies of agricultural produce, or of any other articles whatsoever, as well as all Permits from the local Governors, either for the purchase of any article, or for its removal from one place to another when purchased; and any attempt to compel the subjects of Her Britannic Majesty to receive such Permits from the local Governors, shall be considered as an infraction of Treaties, and the Sublime Porte shall immediately punish with severity any Vizirs and other officers who shall have been guilty of such misconduct, and render full justice to British subjects for all injuries or losses which they may duly prove themselves to have suffered.
Art. III. If any article of Turkish produce, growth, or manufacture, be purchased by the British merchant or his agent for the purpose of selling the same for internal consumption in Turkey, the British merchant or his agent shall pay, at the purchase and sale of such articles, and in any manner of trade therein, the same duties that are paid, in similar circumstances, by the most favoured class of Turkish subjects engaged in the internal trade of Turkey, whether Mussulmans or Rayahs.
Art. IV. If any article of Turkish produce, growth, or manufacture, be purchased for exportation, the same shall be conveyed by the British merchant or his agent, free of any kind of charge or duty whatsoever, to a convenient place of shipment on its entry into which it shall be liable to one fixed duty of nine per cent, ad valorem, in lieu of all other interior duties.
Subsequently, on exportation, the duty of three per cent., as established and existing at present, shall be paid. But all articles bought in the shipping ports for exportation, and which have already paid the interior duty at entering into the same, will only pay the three per cent. export duty.
Art. V. The regulations under which Firmans are issued to British merchant vessels for passing the Dardanelles and the Bosphorus, shall be so framed as to occasion to such vessels the least possible delay.
Art. VI. It is agreed by the Turkish Government, that the regulations established in the present Convention, shall be general throughout the Turkish Empire, whether in Turkey in Europe or Turkey in Asia, in Egypt, or other African possessions belonging to the Sublime Porte, and shall be applicable to all the subjects, whatever their description, of the Ottoman Dominions: and the Turkish Government also agrees not to object to other foreign Powers settling their trade upon the basis of this present Convention.
Art. VII. It having been the custom of Great Britain and the Sublime Porte, with a view to prevent all difficulties and delay in estimating the value of articles imported into the Turkish Dominions, or exported therefrom, by British subjects, to appoint, at intervals of fourteen years, a Commission of men well acquainted with the traffic of both countries, who have fixed by a tariff the sum of money in the coin of the Grand Signior, which should be paid as duty on each article; and the term of fourteen years, during which the last adjustment of the said tariff was to remain in force, having expired, the High Contracting Parties have agreed to name conjointly fresh Commissioners to fix and determine the amount in money which is to be paid by British subjects, as the duty of three per cent upon the value of all commodities imported and exported by them; and the said Commissioners shall establish an equitable arrangement for estimating the interior duties which, by the present Treaty, are established on Turkish goods to be exported, and shall also determine on the places of shipment where it may be most convenient that such duties should be levied.
The new tariff thus established, to be in force for seven years after it has been fixed, at the end of which time it shall be in the power of either of the parties to demand a revision of that tariff; but if no such demand be made on either side, within the six months after the end of the first seven years, then the tariff shall remain in force for seven years more, reckoned from the end of the preceding seven years; and so it shall be at the end of each successive period of seven years.
J. C. Hurewitz, The Middle East and North Africa in World Politics: A Documentary Record, vol. 1: European Expansion, 1535-1914 (New Haven, Conn.: Yale University Press, 1975), pp. 265-66.