> even an average engineer with a five-figure salary can become a millionaire by her late 30s

With my five figure salary in France the max I can invest is 1k/month, so with a 10% RoI I can expect around 200k by the time I’m 30. That’s nowhere near a million and doesn’t take the flat tax in consideration. Maybe 10% is considered low or not risky enough?

> first salary in the low six-figure

Yeah, that’s not gonna happen in Europe.