Using Uber's "Adjusted net loss" figure (-768mm in Q4), I show YoY incremental margins of -35.7% on a net revenue basis, -9.5% on a gross revenue basis.
Net revenue = what Uber gets after drivers.
"Net" (see above) incremental margins are negative, but they have been on a YoY basis for quite a while now.
What's really crazy is the incremental margin on *gross* revenue is also negative.
Q4 '17 +12.3%
Q1 '18 +10.6%
Q2 '18 -0.4%
Q3 '18 -6.5%
Q4 '18 -9.5%
See the problem here?