As the armed group ISIL pushes to dominate more territory in Iraq and Syria, many think that the fighters who have joined ISIL must be motivated by a fanatical commitment to ideology.

But in an extraordinary look inside ISIL with rare access to key figures in the organisation, Al Jazeera correspondent Nick Shifrin found that ISIL's management, organisation, and wealth are all dependent on foot soldiers whose main motivation is income.

Counting the Cost is joined by Michael Stephens, deputy director of RUSI Qatar, to discuss ISIL's source of income.

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