In 1911 MPs began receiving a salary. By paying MPs it was hoped the general population could independently enter politics, rather than simply leaving it dominated by a wealthy elite.
MPs compensation has since betrayed this vision. The system now supports a new political class. In the 1970s MPs' salaries were comparable with average UK income, today they seek triple the average, putting them in the top 2% of earners. Not to mention the abuse of expenses or even illegal activities by some of this political class.