Why are characters different between Osaka and Tokyo?

Tokyo people and Osaka people have different characters. Tokyo people are said to be shy and cool. They aren't concerned with other people. Osaka people are said to be aggressive and talkative. They like to get discounts. I researched about their differences. I knew that their characters were made in the Edo period. I focused on a point. "Why do Osaka people like to get discounts?" Their character was established in the Edo period. Osaka was the center of business. They were freely able to do business in Osaka. There were a lot of merchants. Their customers were merchants. They always thought of how to get good things in a low price. And Then they always ask for a discount. There were a lot of merchants in the Edo which is now Tokyo. Their customers were Samurais. Samurais didn't ask for a discount. Samurais thought merchants were low level. Samurais had pride. They couldn't ask "Discount please". Tokyo merchants had no need to discount their goods. For this reason I know the characters were influenced by this historical back ground.