Weightless Economy可以按照字面译为“无重经济”。

关于Weightless Economy，好像国内还少有相关的定义和描述。

Investopedia中倒是对该词作出了较为详细的解释，具体如下：

The term "weightless economy" refers to the trade of intangible or abstract products and services such as consulting, software, and professional services. The weightless economy sells ideas, information, expertise, or services.

Other terms, such as post-industrial economy or new economy, are also used to describe these intangible products.

The concept of the weightless economy largely evolved at the turn of the 21st century with the rise of information technology and the many products associated with it.

参考译文：

“无重经济”一词是指咨询、软件和专业服务等无形或抽象产品和服务的贸易。 无重经济出售思想、信息、专业知识或服务。

其他术语，如后工业经济或新经济，也被用来描述这些无形产品。

随着信息技术和与之相关的许多产品的兴起，无重经济的概念在 21 世纪之交得到了很大发展。