One country's decline is a benefit to another one. It might sound cold and selfish but the truth is that if one economy is declining, you can use this to your advantage. If one country has a failing economy and they can no longer produce high quality products and their trade is losing significance then another country can sweep in and give better offers. This is simply the reality and so economy should not have emotions in because it will not do you good. If you want to improve your financial state, you have to compete. This is true even with smaller scale marketplace. Not a country's but let's say in one city. If one seller fails to deliver good products, you can sell better ones and take their customers. There is no space in the economy for soft hearted because everything is a competition. You have to compete for resources. You have to compete for demand. You have to compete for customers.
It is not about the heart being soft or hard it is the market and even if one seller is supplying the products you should sell too, because two sellers are better than one seller and same way more sellers are better then less sellers because this is a community and in a community demand never dies and if the product is very essential for the daily life.
Then it does not matter how many sellers are there and it does not matter if you are attracting the customers of another, it is all about competition, you will see two restaurants or multiple restaurants in the same community and all of them are making money and providing food. The demand is the key to this, if there is high demand, provide it, it will not only make you money but it will also increase the growth of the economy as well bro.