Buenos Aires is as exhilarating, as unpredictable, as stylish as ever. But the economic boom is over. Times are hard once again, more shops in Calle Florida are boarded up, the sales are pretty frantic. And so, as Jorge Luis Borges, the blind sage of Calle Maipu, just off the superb Plaza San Martin, once remarked: ‘When Argentina’s economy goes bad, you can be sure that nationalism will soon be beating its wings.’Argentina’s President, Cristina Fernandez de Kirchner, beautiful, combative and ruthless, was already pretty nationalistic when the economy was doing well. In 2007, when her late husband was still president, she and he unilaterally cancelled the agreement with Britain that the two countries should co-operate on oil exploration around the Falkland Islands.