"Liberal" has an existing meaning which has been warped by American politics. Both the American parties have a liberal heritage. Republicans are conservative liberals, and Democrats are largely progressive liberals. Libertarianism is a reactionary liberal ideology that seeks to return to a freer, less-regulated market.
The confusion happened due to FDR. He ran on a progressive platform but the term "progressive" was poisoned in American politics at the time, so he called himself "liberal".
I agree with what you said about liberalism, but I think you're off the mark with regards to left-libertarianism. It's a disparate label, but I can't imagine any of these schools of thought showcasing "the desire for a robust and efficient free market" the parent comment calls for.
Liberal markets + social safety net sounds like garden variety Nordic model democracy to me. The term "left-libertarian" is usually ascribed to groups like Catalonian anarchists or Zapatistas.
"Liberal" has an existing meaning which has been warped by American politics. Both the American parties have a liberal heritage. Republicans are conservative liberals, and Democrats are largely progressive liberals. Libertarianism is a reactionary liberal ideology that seeks to return to a freer, less-regulated market.
The confusion happened due to FDR. He ran on a progressive platform but the term "progressive" was poisoned in American politics at the time, so he called himself "liberal".
There is already a term for what you're describing, simply "left-libertarianism" https://en.wikipedia.org/wiki/Left-libertarianism