@article{Hanson:257119,
      recid = {257119},
      author = {Hanson, Steven D. and Robison, Lindon J.},
      title = {Opportunity Costs and Present Value Models},
      address = {1990-01-01},
      number = {1099-2017-918},
      series = {No. 90-81},
      pages = {25},
      year = {1990},
      url = {http://ageconsearch.umn.edu/record/257119},
      doi = {https://doi.org/10.22004/ag.econ.257119},
}