A more thorough explanation:

Definition: Stockjobbing is the act of buying and selling stocks or shares by jobbers who operate on their own account.

Example: John is a stockjobber who buys and sells stocks for his own profit. He does not work for a company or represent any clients.

Explanation: Stockjobbing is a type of trading where individuals buy and sell stocks for their own benefit, rather than on behalf of a company or clients. The term "jobber" refers to someone who buys and sells stocks for their own account. This type of trading can be risky, as the jobber is solely responsible for their own profits and losses.