scalping
noun [ U ]
uk/ˈskælpɪŋ/ us COMMERCE US
the activity of buying things, such as theatre tickets, at the usual price and then selling them when they are difficult to get at higher prices:
Selling tickets above face value - commonly called scalping - is prohibited by state law.
FINANCE
the activity of buying small quantities or shares, bonds, etc. and then selling them quickly in order to make a small profit