As controls for estates without hollænderier and the presence of an estate demesne in the parish are included in column 4, the size of the effect is more than cut in half but is still highly significant.
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The sentences
It is, however, worth noticing that when using the instrumental variable strategy \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$elites1782$$\end{document} e l i t e s 1782 remain significant while other estates now have a negative impact and crown estates are only borderline significant. 29 We note that there is no significant relationship between butter production in the 1600 s and the location of hollænderier , which would indicate serious endogeneity problems.