If the Simplico mine is solved with all parameters remaining the same except that (u=1.2) is changed

Question:

If the Simplico mine is solved with all parameters remaining the same except that $u=1.2$ is changed to $u=1.3$, the value of the lease remains unchanged to within three decimal places. Indeed, quite wide variations in $u$ and $d$ have almost no influence on the lease price. Give an intuitive explanation for this.

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