If all restaurants doubled their prices, but, at the same time, paid their employees a proper wage (and made that public) and removed tipping, they could effect

If all restaurants doubled their prices, but, at the same time, paid their employees a proper wage (and made that public) and removed tipping, they could effectively raise their prices 20% (the expected tip) without any impact on the customers. McDonalds manages to make profits in EU/AU/NZ/CA etc while (mnostly) complying with local minimum wages and conditions. The Big Mac index shows that their actual prices are within a narrow band compared to the US. They (and other megacorps like Walmart) exploit both their workers and their customers, who end up paying the workers via the inefficient means of tax credits and poverty relief instead of the corporations/businesses being required to pay proper wages and contribute to their local communities via taxation.