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比例性テスト
投資額が事業の総コストに対して十分な割合であるかを判断する基準。事業の総コストが低いほど、投資比率は高く（ほぼ100%に近く）なければなりません。高額な事業では50%程度でも認められる場合がありますが、低コスト事業では75%以上が目安です。
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