@unpublished{publication-6271,
	author={Stadel, Daniel and Stahl, Florian and Iyengar, Raghuram and Herrmann, Andreas},
	institution={University of Zurich},
	number=2011,
	series={Department of Business Administration},
	title={Intertemporal trade-offs between contract periods, price discounts and flexibility},
	year=2011,
}