Usually some combination of lack of demand, lack of production facilities and possibly pricing/subsidies.
Milk, in quite a number of countries, is price controlled either directly or through subsidies. This makes it hard for alternatives to be competitive. Once it isn’t very price competitive, demand tends to be limited and once demand is limited, not many companies invest in production – meaning it doesn’t get cheaper quickly. This is why it is generally hard to break into a market with a strong incumbent.
It has less to do with any technology/knowhow or availability of raw materials.
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