“I don’t think it’s an on-off switch,” Jason Bordoff, the co-founding dean of the Columbia Climate School, said in an interview. “It’s more of a linear effect. The more countries that are in the coalition, the more effect it will have. It’s going to be pretty modest if you don’t have the big countries as part of it.”
Another key factor will be at what level the price cap is set. U.S. officials have suggested they intend to fix it slightly above Russia’s marginal cost of production, according to a person familiar with the matter, although the final level would depend in part on the global oil price when it comes into effect.