An article in the Economist stated, The appeal of GDP is that it offers, or seems to,

Question:

An article in the Economist stated, “The appeal of GDP is that it offers, or seems to, a summary statistic of how well an economy is doing.”
a. In what sense does GDP offer a summary statistic of how well an economy is doing?
b. Why qualify the statement about GDP as a summary statistic by including the phrase “or seems to”?

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