Short answers, pulled from the story.
A hawker is distinguished from a peddler primarily by mobility. Hawkers keep moving, while peddlers may take up a temporary fixed pitch in a public place. Hawkers also tend to sell non-perishable items such as brushes and cookware, while costermongers deal specifically in fresh produce.
India has ten million street vendors, according to the Ministry of Housing and Urban Poverty Alleviation, with 250,000 in Mumbai, 200,000 in Delhi, over 150,000 in Kolkata, and 100,000 in Ahmedabad. The Street Vendors Act received presidential assent on the 4th of March 2014, but as of April 2017 only three states had implemented it.
Pedagang kaki lima is the Indonesian term for street hawkers and means "five-foot trader". It derives from a colonial-era regulation issued by British Governor-General Thomas Stamford Raffles in Batavia (1811-1816), which mandated covered sidewalks roughly five feet wide. A Malay linguistic inversion transformed "five-foot way" into a name for the vendors who occupied those sidewalks.
Roman hawkers had no single name; researchers Claire Holleran documented labels including ambulator, circitor, circulator, and institor. They clustered around temples, theatres, bathhouses, and forums to reach the largest crowds, selling everyday food at low prices. Roman society regarded them as a low-status nuisance, viewing retail trade generally with disdain.
R. White's Lemonade was founded in 1845 by Robert and Mary White, who sold their drinks around south London from a wheelbarrow. The company grew from that mobile street-vending operation.
The pregon is a genre of Cuban and Latin American music built around the cries that street vendors used to advertise their goods, known formally as canto de los vendedores ambulantes. The form transforms the functional hawking chant into song.