Final answer:
Manufacturing and industry are significant contributors to Shanghai's GDP, accounting for nearly half of it and offering substantial employment opportunities.
Step-by-step explanation:
Half of Shanghai's GDP is derived from its manufacturing and industry sector. This sector not only contributes to nearly a third of the city's GDP but also provides jobs to almost one-fifth of the total workforce. Shanghai, the largest city in China, has grown into a massive metropolis, attracting businesses and workers alike with its robust economy fueled by manufacturing, industry, and various other advanced sectors such as biotechnology, telecommunications, and alternative energy technologies.