Which ancient civilization created the world's first known retail 'shopping mall' with standardized weights and multiple shops under one roof around 100 BCE?

The history of retail spans thousands of years, with innovations that might surprise modern shoppers. From ancient marketplaces to the first department stores, retail history reveals fascinating insights into human commerce and social development. This trivia question explores an early retail innovation that revolutionized shopping experiences and set the foundation for modern retail concepts we still use today.

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Roman Empire (Trajan's Market in Rome)
Ancient Egypt (Great Market of Alexandria)
Han Dynasty China (Imperial Shopping Pavilion)
Mauryan Empire India (Pataliputra Grand Bazaar)