 In this module we are going to study the consumer behavior under the heading of consumption bundle. This combination of the two words mean the consumption bundle we are mostly utilizing in our study of microeconomics. So, what is the meaning of this consumption bundle? When we say a consumption bundle, we define this that these are the combination or the group of those objects that a consumer is going to select or a consumer is going to purchase. So, that combination will be called the consumption bundle. And this consumption bundle it represents that basket of the goods, which is a hypothetical basket which we call combination of goods or the services which the consumer is either purchasing or desires to purchase. Now, if we are keeping the two commodities bundle on one side and similarly the other bundle can also be available to us, then we will have to see that the two bundles can be that the two goods are the same, that is, it may be in this, it may be in the other, so when there will be the two different, then we will be giving the two different notations because it may be in some one, if I say that if there is a basket in which there are three mallets and two safes and similarly there is one basket in which there are two mallets and three safes, then the individual commodities are the same, that is, we say that the mallets and safes, but since the number of both and the land is separated, then one bundle will be separated, the other bundle will be separated, and similarly if it can be in some one, the number increases, instead of five, there are six in one, five in the other, then when the quantity will be different in such a bundle, then we will take it under a separate basket and whenever we have to take it, then our term is what we call complete. What does complete mean here? When we say that it is not only the list of the commodities and the service available, rather, we have to look at the entire behavior of the consumer in the context of that completeness that what was required at that time and if we look at the other factors with that time, who were with us, then if we look at the word of complete as a complete expression, then the completeness in the consumption bundle, we have to look at all the aspects of the consumer behavior, that when the consumer was going to utilize that thing, what was the time of that time? Was it a particular weather need or was it a need for an event base or if he was using it, then the location will be different, now it is exactly the same way, when we do the consumer behavior assessment, that today's need, yesterday's need and the future need, then there can be a difference in the three, similarly, if you see, then some things we need in terms of winter, then it is possible that we do not desire the same bundle in the hot weather, something we need in the rainy season, then we do not take it in the heat, similarly there is an area for that, we will need some things in our travel tours, it may be possible that the needs of the residential areas are totally different, so if we look at the first factor in terms of the need, then the consumption bundle and its preference, along with it, we will have to look at this thing, that the word complete express that it is not only the number of commodities, it also has attached features, which we need to look at in terms of the medium, now in consumer behavior, the consumer is never using only two items in his life, he is using a variety of goods, services, because when we use it in the illustrations of our economics or in the drawings, then we have only two items available, x-axis and y-axis, so when we express those things in our consumption bundles, then we make it two sets, we say that one thing that we are analyzing or focusing on is that, and apart from that, all the commodities or services in the demand of the consumer, we call them all other goods, now the purpose of all other goods is that the consumer makes a bundle of all the things that he is using in his life, and the one thing that we are focusing on, in which the prices can change, we want to look at the behavior changes of the consumer, how it can be changed in terms of the quantity of the prices, so the consumer is doing the analysis, we will keep it one and the other, so when we look at these two parts, then if we look at the income, then the income of the consumer will never be above our consumption, this was our main assumption, so now if we divide the income, the commodity or consumption bundle A's price, the income divided by price of x will be one part, and all other part of the income will be spent on the purchase or the consumption of all other goods, so now if we express it, then we write in this form that price of x multiplied by the commodity purchased plus x2, and what is x2, all other goods or the consumption bundle, it should be either equal to m or i which we will rotate with the income, or it should be less than, so the expenditure of the consumer is either equal to income or less than, so we express it in this form, now if we look at the consumption bundle, if we are taking one bundle, then we can say that in the bundle, commodities x1, x2, x3 and up to xn can be done, similarly the other bundle can be done in the same way, 1, 2, 3, 4, many things can be done, and in this bundle, whatever we give the notation to x and use that ith form of the member of that, then it should be our non-negative, if the quantity of the commodity is not coming from the non-negative, then it is not a part of our set, so it can never be that the consumer uses a non-negative form, so whenever we take the commodity, it will be non-negative, i.e. its existence should be present, despite of that fact that its quantity should be very little, otherwise zero commodity cannot be in our consumption bundle, and in the consumption bundle, all the commodities we have in the property, whenever we take it, then we have a feature in it that we can take its quantity as a lump sum, we will not take it in pieces, it can be perfectly divisible, and we will keep units in the perfectly divisible, whether it is in this unit or in the other one, but when we have to express it, then we will always do it whenever, we will do it in discrete amounts, whenever we write it, then we use it in units in such a way that when we use it, if we talk about orange, then we say one orange, if it is like this apple, it means it is in complete form, it is half or three fourths, or it is not, it is another thing that it is divisible, it can be divided but if we utilize it to do that, then we will express it in the same form.