The walls are reduced almost to disappear because the market has become a single market 10. The manufacturer will send the items to sell in this market and widening their business easier.
Tariffs are reduced and almost eliminated the 10 markets into a single market. The manufacturer will send the goods to sell in this market and expand their business more easily.
Drum is reduced and almost gone, because 10 market became a single market. The manufacturer to deliver the goods to sell in the market, and expand their business easier.