扩散指数（Diffusion Indexes）是以测定各个经济指标循环波动为基础，得到的表征经济指标在一定时点上扩散程度的加权百分比数值序列。
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Readings below 50 in such diffusion indexes are seen as an indication of economic contraction, while readings above signal expansion.
FORBES: Precious, Base Metals All Boosted By Hopes For Further Monetary Easing
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