Identify and list out the subjects of each sentence in the following passage.
Passage: "Retail markets and shops have a very ancient history. This history dates back to antiquity. Some of the earliest retailers were itinerant peddlers. Over the centuries, retail shops were transformed. They were transformed from little more than "rude booths". They were transformed into sophisticated shopping malls. This happened in the modern era. In the digital age, an increasing number of retailers are seeking to reach broader markets. They are selling through multiple channels. These channels include both NAME_1 and mortar and online retailing. Digital technologies are affecting the way consumers pay for goods and services. Consumers are paying for goods and services using digital technologies. Retailing support services may include the provision of credit. Retailing support services may include the provision of delivery services. Retailing support services may include the provision of advisory services. Retailing support services may include the provision of stylist services. Retailing support services may include a range of other supporting services. Retail workers are the employees of such stores."
Generate output in row wise format with two columns: sentence number - subject.