波及效应是投入产出分析的核心问题。

Spread effect is the key problem in inputoutput analysis.

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本文首先重点介绍了研究的理论基础，阐述了世博会及世博经济的概念，并对乘数效应和投入产出系数做了相应的解释。

Firstly, the paper introduced theory base of the study, explained what is Expo and Expo economy, expatiated on multiplicator effect and coefficient of input-output unit.

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