I'm able to read the graph fine, but I'm not sure if you understand it either that or you misunderstood my post (not ascribing fault to you, might be my own if that's the case) All the horizontal graph shows is that rate of change since the 1970's. It places a value of one in 1970 and then shows by what percentage the real median wage increased over the years (this takes inflation into account). It doesn't show the actual median wage. Again, US median wages are higher than France still today even though they've seen a 280% increase since 1970 (that's why the graph for France ends at 2.8. 2.8=280% not their actual wage.
Again US median wage is about $52,000 and in France it is $35,000. Even with our no good, terrible trickle down economics.