Why might incomes of $1 a day and $2 a day underestimate the value of the goods and services that these households actually consume?

Poor India makes millionaires at fastest pace India, with the world’s largest population of poor people, also paradoxically created millionaires at the fastest pace in the world. Millionaires increased by 22.7 percent to 123,000. In contrast, the number of Indians living on less than a dollar a day is 350 million and those living on less than $2 a day is 700 million. In other words, there are 7,000 very poor Indians for every millionaire.