What a beautiful question.
Early administrative decisions in China’s Ming Dynasty eventually caused a drastic fall in tax revenues, a reduction in military preparedness,the collapse of the currency system, and failed to make sufficient investment in vital transportation infrastructure.
We need a "and" before "the collapse", because the decisions caused 3 things "fall", "reduction"and "collapse". We never say that "At the party John ate,
...
Early administrative decisions in China’s Ming Dynasty eventually caused a drastic fall in tax revenues, a reduction in military preparedness,the collapse of the currency system, and failed to make sufficient investment in vital transportation infrastructure.
We need a "and" before "the collapse", because the decisions caused 3 things "fall", "reduction"and "collapse". We never say that "At the party John ate,
...







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