From the 2012 African Health Network OER Impact Study:
It is not possible to cite conclusive statistical evidence to show that financial savings are being achieved through the use of OER. However, the cumulative weight of evidence from the accounts and experiences of academics strongly suggests that direct and indirect forms of financial savings are being realized. Evidence of direct savings is strongest in the case of complete sets of learning materials or textbooks that students would otherwise be required to buy. OER video productions that are ‘enhancements’ or supplementary to the normal lecture programme are self‐evidently less likely to result in direct financial savings […] There were several indications that OER achieve significant indirect forms of savings through interrelated combinations of the following:
a) Savings in time.
b) Improved quality/effectiveness of learning.
c) Enabling teaching on topics that might otherwise not be covered.
d) Fostering collaboration between academics.