mand curve slopes downward from left to  right.Answer: DEMAND curve slopes downward from left to right because of the law of diminishing marginal utility. According to this law, the utility/satisfaction of the consumer goes on decreasing with every additional consumption of the commodity and hence, the consumer will buy more goods only when the price decreases.I Agree from this statement.(2)  Price is the only determinant of demand.Answer:Price is the only determinant of demand. Substitute goods: A commodity will have elastic demand if there are good SUBSTITUTES for it. This is because when price of a good rises, a consumer will not buy the good but purchase its substitute.I Agree from this statement.(3)  When price of Giffen goods fall, the demand for  it increases.​Answer: It is quite rare and WHETHER it really happens has a little UNCERTAINTY. But, it shows that there are two factors affecting demand price (substitution effect) and income. With a Giffen good, if rice continues to rise in prices, demand may eventually fall because the poor workers will not be able to even afford rice.I Disagree from this statement.HOPE IT'S HELP YOU...THANK YOU !!!Prajna Shetty