Why are commercial propeller aircraft smaller than commercial jet aircraft? I've read that turbo-prop aircraft are more efficient than jet-aircraft. Browsing this Wikipedia page it looks like in general, jet airliners burn less fuel per passenger. I imagine this is due to jet aircraft typically carrying more people, and flying longer in cruise. Is there some fundamental reason why traditional propeller designs couldn't be scaled up to 150+ passengers and trans-oceanic ranges? If it was possible, would air travel become substantially more efficient per passenger?

Edit: Perhaps a better phrased question would be: are turboprop aircraft always more efficient, regardless of airframe size? Or is there some regime where modern turbofans take over? I'm specifically asking about fuel efficiency (i.e. ignoring noise / speed).
There are a number of problems:


Speed


Traditional Propeller aircraft are much slower than jets. Propellers decline in efficiency as they increase in speed.


Noise


For the same thrust, propellers are noisier then jets.


Development Cost


There have been efforts for propellers but so far they have not been justified by economics.

GE36 Engine