Cause effect chart . . chinese exploration and isolation. causeeffect. ming emperors disallowed foreign trade.. the reason why they disallowed trade was because china became very isolated.. . chinese citizens who made goods for trade lost income.. ming emperors desire to show the greatness of their rule and to collect tribute.. . . chinese require payment in gold and silver.. ming leaders ban ships with more than two masts. there will be no further construction of ships.. . . . the chinese keep close control over contact with europeans..