  Economic complexity reflects the amount of knowledge that is embedded in the
productive structure of an economy. By combining tools from network science and
econometrics, a robust and stable relationship between a country's productive
structure and its economic growth has been established. Here we report that not
only goods but also services are important for predicting the rate at which
countries will grow. By adopting a terminology which classifies manufactured
goods and delivered services as products, we investigate the influence of
services on the country's productive structure. In particular, we provide
evidence that complexity indices for services are in general higher than those
for goods, which is reflected in a general tendency to rank countries with
developed service sector higher than countries with economy centred on
manufacturing of goods. By focusing on country dynamics based on experimental
data, we investigate the impact of services on the economic complexity of
countries measured in the product space (consisting of both goods and
services). Importantly, we show that diversification of service exports and its
sophistication can provide an additional route for economic growth in both
developing and developed countries.
