@conference {635351, title = {Selling Information Through Consulting }, booktitle = {ACM-SIAM Symposium on Discrete Algorithms (SODA 2020). Presented in ACM/INFORMS Workshop on Market Design 2019}, year = {2020}, url = {https://arxiv.org/abs/1907.04397}, author = {Yiling Chen and Haifeng Xu and Shuran Zheng} }