What is the significance of Jupiter in the 2nd house?

Since the 2nd house governs family wealth, speech, and values, and Jupiter signifies expansion and abundance, this placement is generally read as strong wealth-building potential. But it isn't automatic — if Jupiter is debilitated or acts as a functional malefic for that Ascendant (as it does for Gemini or Virgo), the promise weakens or reverses. A clean, unafflicted Jupiter here tends to give righteously earned prosperity and wise speech; an afflicted one can bring financial obstacles or even miserliness.