Recall that marginal utilities dimi

Recall that marginal utilities diminish with increasing consumption of a
good. In a private market equilibrium, fireworks are consumed until their
marginal utility equals the marginal utility of ice cream (since the prices of
both goods are $1). But the optimality calculation shows that fireworks should
be consumed until their marginal utility is half the marginal utility of ice cream;
that is, more fireworks are consumed in the optimal public goods outcome
than in the private outcome.

Hasil (Bahasa Indonesia) 1:

Ingat bahwa utilitas marjinal mengurangi dengan peningkatan konsumsiBagus. Dalam kesetimbangan pasar swasta, kembang api dikonsumsi sampai merekautilitas sama dengan utilitas es krim (sejak hargakedua barang adalah $1). Tapi kontinyu perhitungan menunjukkan bahwa kembang api harusdikonsumsi sampai mereka utilitas setengah utilitas es krim;itulah, kembang api lain dikonsumsi dalam hasil optimal barang publikdaripada hasil pribadi.