There's no right answer but here's how TPG staffers and readers think about what a first-class upgrade is worth.

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Aquino, E. R., Navarro Torres, V. F., Paniz, I. L., Sotomayor, J. M. G. and Carvalho, J. F. (2025) Reducing Waste Handling by Optimizing Slope Angles in Compact Rocks: A Contribution to the Circular ...