The first, analyze the family saving income effect and substitute effect.
第一，分析对家庭储蓄的收入效应和替代效应。
Weather the income tax influence on saving behavior is positive or negative depends on the net effect of income effect and substitute effect resulted by the tax saving.
所得税对储蓄行为的影响是积极的还是消极的，取决于税收储蓄的收入效应与替代效应的相对大小。
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