Michael O. Church made a model of US social classes in 2012. The percentages given refer to US population numbers only. These models may have a limited correspondence to the social classes of Europe. I have taken the information from the original article and condensed it further.

• Underclass (U) - 10 …

When making bread, the recommendation is to place the dough in a warm spot to rise for about one hour. Since we hardly heat the house in winter (the thermostat is set at 12°C; the living room is a bit warmer still) this proved a bit of a challenge …