Issue with fuel preference elasticity

[bitzhz]

Dear all,

I'm working on a new global electrification scenario by describing more ambitious electrification levels in every sectors within SSP scenarios. And I've checked previous discussions about share-weights, which are very helpful. And I noticed that adjusting fuel preference elasticity is a more common choice, especially in different sector-SSP.xml. Using Building_SSP1.xml and Building_SSP3.xml as examples, fuel preference elasticity is respectively -1.5 and 0 applying fill-out rule. I didnt find anyting helpful about explaining it in the documentary but a simplified definition "Elasticity dictating how share weights change with GDP per capita". But I dont know how model uses it or mathematical formulas. And how to calibrate the fuel preference elasticity if I want to increase the share of electrification? I would be very grateful for any help offered.