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Knowledge graphs are used in various applications and have
been widely analyzed. A question that is not very well researched is: what is the price of their production? In this paper, we propose ways to estimate the cost of those knowledge graphs. We show that the cost of manually curating a triple is between $2 and $6, and that the cost for automatically created knowledge graphs is by a factor of 15 to 150 cheaper (i.e., 1c to 15c per statement). Furthermore, we advocate for taking cost into account as an evaluation metric, showing the correspondence between cost per triple and semantic validity as an example.
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