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Agreed but it doesn't have much explanatory power for B (compared to other countries or possible alternative histories etc ) buyers everywhere, of everything, choose lower price ( for same quality, speed) - firms upgrade in some places but not others
e. g. BGMEA say reason to keep out foreign factories is that they would raise wages. Important consequence of the elite politics? I'll have to read the book! 
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in 
. So costs of port congestion, high interest rates, electricity outages, politicised unions etc also bear down on wages