https://www.brookings.edu/wp-content/uploads/2017/09/4_alganetal.pdf
https://knowledge.wharton.upenn.edu/article/why-are-the-markets-collapsing-how-bad-will-covid-19-really-be/?utm_source=kw_newsletter&utm_medium=email&utm_campaign=2020-03-17
https://www.nabu.de/imperia/md/content/nabude/landwirtschaft/agrarreform/171121-executivesummary.pdf