Read this: The Paris department store had its roots in the magasin de nouveautés, or novelty store; the first, the Tapis Rouge, was created in 1784. They flourished in the early 19th century, with La Belle Jardiniere (1824), Aux Trois Quartiers (1829), and Le Petit Saint Thomas (1830). Balzac described their functioning in his novel César Birotteau. In the 1840s, with the arrival of the railroads in Paris and the increased number of shoppers they brought, they grew in size, and began to have large plate glass display windows, fixed prices and price tags, and advertising in newspapers.

What factors influenced the increase of department stores in Paris? 
What is the answer? (If it cannot be answered, return "unanswerable")
the arrival of the railroads in Paris and the increased number of shoppers they brought