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A dollar peg means pegging to a strong country.
Literal
Dollar-peg [possessive-の] meaning [topic-は], strong country [to-に] peg [quotative-ということです].
ドルペッグ (dollar peg) is a financial loanword. ~ということです is a formal way to explain meaning: 'it means that...' つけ is a colloquial imperative of つける (to attach/peg), giving the explanation a punchy, direct feel. A compact definition of a financial concept.