If we look at how much we spend attending an international conference, it can be very expensive.
We spend more money on travel, accommodation, meals, car rental and unspecified expenses. There is no way to reliably account for such expenditure, but it has accounted for 76% of conference costs in previous reckoning 3).
What is a 'reasonable' end-figure for attending a conference event, how do we judge their value, and does it make any difference if we are paying ourselves or a funding budget is used?
http://chronicle.com/article/2013-14-AAUP-Faculty-Salary/145679?cid=megamenu#id=table
http://systemdynamics.org/PolicyCouncil/2006/s06_vp-meetings-conf-cost-trends.pdf
https://www.ieee.org/documents/08s_OConnor_supplement.pdf