A chemical firm is considering how best to supply the world market for sulfuric acid. A manufacturing plant costs about $$\$20$$ million to construct and requires a moderately skilled workforce. The total value of the world market for this product over the next 10 years is estimated to be between $$\$ 20$$ billion and $$\$ 30$$ billion. The tariffs prevailing in this industry are moderate. What kind of location(s) should the firm seek for its plant(s)?