ITS A SCORCHING February afternoon in Buenos Aires Plaza de Mayo, and even the protesters seem exhausted. Evita and the Peronists once gathered here; the place has seen bombings, riots and countless rallies, but todays demonstration against unemployment is tempered by the oppressive heat. It has been five years since Argentina defaulted. Although todays weary flag-wavers and drum-beaters are correct in proclaiming that poverty is still rife, it is also true that president Néstor Kirchner has just overseen four consecutive years of 8%-plus growth. The debt to the IMF has been repaid, and as Argentina renegotiates its relationship with the international capital markets there are signs that its domestic markets are awakening from their own torpor. In the huge open-plan office at the heart of MBA Inversiones, an Argentine investment bank partnered with Lazard, teams of bankers loosen their ties and work the phones furiously: ignore the heat, theres money...