On an average, American families with more income tend to contain fewer children than families with less income. This fact recommends that, at least from a purely statistical perspective, the American children are: (1) Inferior goods. (2) Substitute goods for the cats and dogs. (3) Complementary with luxury yachts, cars and mansions. (4) Luxury goods, much similar to fur coats and diamond rings.
Find out the right answer from the above options.