the model minority myth is exactly that - a myth. when the doors of immigration were swung open to asians in 1969, a flood of them came into this country, already armed college educations and bringing along their families' inheritance. so when you see many middle to upper middle class asians, its not that they "worked their way up", but that they were already in that economic situation to begin with. it should be pointed out that these immigrant families, many times, came from the elite class of their native countries. sending their 2nd generation kids to college was not a hope but expectation, hence the high rate of asian enrollment at top universities.
think about it - it costs money to open a subway, or a dry cleaners for that matter.
but as always, there are exceptions.
Where in the world do you get this information from??? Rich asians weren't flooding the US. Rich asians were for the most part staying put because rich Asians were well, rich and didn't need to go somewhere else to find opportunities unlike the vast majority who were in poverty. What inheritances were these rich asians getting? Let me tell you folks from Communist China weren't immigrating to America with vast sums of wealth, Taiwan was a developing country as was Korea. By your 1969 date the only really established Asian country from which rich asians would really be able to come from was Japan but even Japan is debateable as it was hardly rich at the time. As to money to buy cleaners, markets, etc. you've seen where these establishments (at least initially) are right? Those Korean markets were/are not started in areas where you need significant amounts of money to start them up.