The Economist Group, parent of The Economist, made 48.9% of revenue from circulation and 35.08% from advertising for fiscal year 2012 [1].
[1] http://www.economistgroup.com/results_and_governance/annual_...
[1] http://www.economistgroup.com/results_and_governance/annual_...
The Economist on the other hand is mostly analysis, and have extremely dedicated readers who gladly pay the premium.