Since 1949, Shanghai has been a comparatively heavy contributor of tax revenue to the central government; in 1983, the city's contribution in tax revenue was greater than investment received in the past 33 years combined. Its importance to the fiscal well-being of the central government also denied it from economic liberalizations begun in 1978. In 1990, Deng Xiaoping finally permitted Shanghai to initiate economic reforms, which reintroduced foreign capital to the city and developed the Pudong district, resulting in the birth of Lujiazui. As of 2020, Shanghai is classified as an Alpha+ city by the Globalization and World Cities Research Network, making it one of the world's Top 10 major cities.