@article{avectormonotonicityassumptionformultiple,
  title = {A Vector Monotonicity Assumption for Multiple Instruments},
  author = {Leonard Goff},
  year = {2020},
  eprint = {2009.00553},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2009.00553v6},
}