Straight,curly,bodywave,etc! Frontals and closure are also very popular in this industry. Lastly hair tools can boost sales. Lashes, brushes, combs. A website .
Revenue sources come from investor and will detail all spending to calculate cost and where money has went.
Profits. example one 14" lace closure hair piece is $20 wholesale. Customers would purchase for $50 thats $30 profit.