答案:【计分规则】: Positive effect: Firstly, the diversified reserve system has solved the Triffin dilemma to a certain extent. The diversification of international reserve currencies is inevitable. Secondly, Jamaica's monetary system is a mixed exchange rate system, which can respond flexibly to the changing objective economic conditions and is conducive to the development of international trade and the world economy. Thirdly, Jamaica's monetary system adopts a complementary method of various adjustment mechanisms to the balance of payments, which is in line with the unbalanced development of the world economy. Negative effect: firstly, all the major industrialized countries adopt floating exchange rate regime, which makes the exchange rate fluctuate greatly. Secondly, reserve currency management is complicated. Three reasons should be mentioned: first, due to the floating exchange rate regime, the exchange rates of the major reserve currencies fluctuate frequently, which is greatly detrimental to developing countries. Second , diversification of reserve currencies increases exchange rate risks in international financial markets, resulting in frequent short-term capital flows and further increasing the complexity of reserve asset management in countries around the world. Third, the diversification of reserve currency does not essentially solve the problem of reserve currency being both a world currency and a sovereign currency. Thirdly, there is no effective balance of payments adjustment mechanism. First, the IMF's lending mechanism does not promote balance of payments well. Second, the balance-of-payments adjustment mechanism, which is completely regulated by the deficit countries, cannot maintain stability and balance. Lastly, due to the diversification of reserve currency and exchange rate arrangements, the roots of monetary crisis and international financial crisis have also become diversified. However, Jamaica's monetary system lacks effective subjective or objective crisis warning indicators, thus making crisis prevention nowhere to begin.