In 1622 Malynes became embroiled in the first important economic controversy in England on the "balance of trade" in this reply to Edward Misselden's Free Trade. His recommendations--principally higher import duties, prohibition of bullion exportation, the staple system and resurrection of the office of Royall Exchange--evidence a considerable theoretical underpinning. "No other writer surpassed him in clear and full understanding of the international mechanism of foreign exchanges."