Barbeque Nation and economic concepts

Diminishing Marginal Utility :

In barbeque nation people visit to have unlimited food. At initial stage of having food the utility derived from consumption of each items increases and satisfication also increases. But, as consumption reaches at the maximum level then the utility derived from consumption of each items decreses. 
For example : If you have one plate of biriyani when you're hungry you'll be satisfied but if you have another plate you'll reach maximum amount of satisfaction, but after having the second plate your satisfaction level starts decreasing.

People Respond to Incentive :

In barbeque nation if the customers celebrate birthday or Anniversary, they provide the customers with a customised cake which is an incentive which no other restaurant provides. Thus, people respond to incentives.

Monopolistic competition :

In Food Industry many firms offer food products and services that are similar, but not perfect substitutes are available. Barriers to entry and exit are low, the decisions taken by one firm do not directly affect those of its competitors.

Price Discrimination By Self Selection :

Barbeque Nation provides coupons and cash back that attracts the customers and make them choose barbeque nation compared to other alternatives.

Economies of Scale :

Barbeque Nation produce large quantities of food to it's customers which helps them to cut down their cost of production by producing large quantities and varities.