Why IRR sensitivity is asymmetric with capex changes in a typical infrastructure project ?

When we run senstivities on IRR by lowering or increasing capex at equal percentages why IRR yields asymmetric results, i.e. the increased IRR due to 10% lower capex is not symmetric to decreased IRR using a 10% higher capex scenario.

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Why IRR sensitivity is asymmetric with capex changes in a typical infrastructure project ?

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Why IRR sensitivity is asymmetric with capex changes in a typical infrastructure project ?

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