Country (A) bubble was obvious. During the mid-2000s, it went from being a country that specialized in flowers and iron and ore smelting to a country that specialized in global finance. Country (A) biggest banks grew to 10 times the size of their economy by offering people and businesses overseas higher interest rates than they could get at home. Then, armed with this cash, Country (A)'s bankers bought foreign companies, foreign real estate, and even bought foreign soccer teams. The problem, in other words, was that Country A's banks were not only paying high prices for questionable assets, but also promising to pay their depositors high interest rates. This was about as unsustainable as business models get, and it wasn't that hard to tell.
According to situation described in the above paragraph, explain the last statement of this paragraph “This was about as unsustainable as business models get, and it wasn't that hard to tell.”