please explain why it's false or true.wanna know reasons to understand.. thanks

6) TRUE or FALSE for each of the following statements. Also give the brief explanation to support each of your answer. 6.1 Demand for cigarettes of teenagers seems to be more price elastic than the demand for cigarettes of adults. 6.2 Now people in some countries could experience both negative real interest rate and negative nominal interest rate. 6.3 The concept of "Big Fish eats small fish" or the advantage of big size company in the business competition has been the most important key success concept adopted by several big companies in the world until now. 6.4 Price elasticity of demand on hand lotion of a specific brand is equal to -1 (or unity demand), because we could observe that when price of lotion changed from 20 $/bottle to 22 $/bottle, the demand of that lotion decreases form 10,000 bottles per month to 9,000 bottles per month. 6.5 When you use your own house to be your home office (for free) instead of renting, your economic profit and business profit of your business tend to increase because you save your renting cost. (25 points) End of Exam