The fact that whether a good is normal or inferior depending on a consumer's level of income, is an important point. Very poor people, and very poor countries can't afford to treat many goods as inferior. The cheapest form of food may well be a normal good for someone who is undernourished.
Likewise, the very wealthy may treat goods as inferior that many of us treat as luxuries. At a certain point in one's wealth accumulation rather than vacation, one may purchase a permanent residence in a desirable location. One may hire a chef rather than dine out in fine restaurants.. etc.
Again, keep in mind that whether a good is normal or inferior is simply a matter of actual behavior, not of value judgment.
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