by governments of the Kingdom of Siam and the Republic of the United States of America, Treaty of Amity and Commerce between Siam and the United States (1833)
“ No prices shall be fixed by the officers of the King on the articles to be sold by the merchants of the United States, or the merchandise they may wish to buy, but the Trade shall be free on both sides to sell, or buy, or exchange, on the terms and for the prices the owners may think fit. Whenever the said citizens of the United States shall be ready to depart, they shall be at liberty so to do, and the proper officers shall furnish them with Passports: Provided always, there be no legal impediment to the contrary. ”
