A shift to the right in the demand curve can occur for a number of reasons: 1  Income. An increase in disposable income enabling consumers to be able to afford more goods. Higher income could occur for a variety of reasons, such as higher wages and lower taxes.  Quality.
http://www.economicshelp.org/microessays/equilibrium/demand/
In economics, the demand curve is the graph depicting the relationship between the price of a certain commodity and the amount of it that consumers are willing and able to purchase at any given price. It is a graphic representation of a demand schedule.
https://en.wikipedia.org/wiki/Demand_curve
When the demand curve shifts to the right and increases, the demand for money increases and individuals are more likely to hold on to money. The level of nominal output has increased and there is a liquidity advantage in holding on to money.
https://www.boundless.com/economics/textbooks/boundless-economics-textbook/monetary-policy-28/introduction-to-monetary-policy-117/shifts-in-the-money-demand-curve-460-12557/
Also, think about the law of demand. If the price is low, that increases the demand for goods from Costco. That's why Costco has to sell items in bulk. If they sold small items for too cheap, they wouldn't be able to make money. Also, Costco has rapid inventory turnover.
https://answers.yahoo.com/question/index?qid=20080608143631AAFFqLN
Shifts in the demand curve. This occurs when, even at the same price, consumers are willing to buy a higher (or lower) quantity of goods. This will occur if there is a shift in the conditions of demand. A shift to the right in the demand curve can occur for a number of reasons: Income. An increase in disposable income enabling consumers to be able to afford more goods. Higher income could occur for a variety of reasons, such as higher wages and lower taxes.
http://www.economicshelp.org/microessays/equilibrium/demand/
Factors that Cause Demand to Shift. A demand curve has the price on the vertical axis (y) and the quantity on the horizontal axis (x). The shift of the money demand curve occurs when there is a change in any non-price determinant of demand, resulting in a new demand curve.
https://www.boundless.com/economics/textbooks/boundless-economics-textbook/monetary-policy-28/introduction-to-monetary-policy-117/shifts-in-the-money-demand-curve-460-12557/
In economics, the demand for money is the desired holding of financial assets in the form of money. The nominal demand for money generally increases with the level of nominal output (the price level multiplied by real output). The interest rate is the price of money.
https://www.boundless.com/economics/textbooks/boundless-economics-textbook/monetary-policy-28/introduction-to-monetary-policy-117/shifts-in-the-money-demand-curve-460-12557/
Those straight line curves are just to give a basic, visual understanding of the economic principles. In practice it is imperfect, but the trends are the most important thing. To answer the question as to why everything is so generalized, well it does get more complex the further you go in economics. Lots of college kids have a hard enough time with the basic stuff.
https://answers.yahoo.com/question/index?qid=20080608143631AAFFqLN
There is movement along a demand curve when a change in price causes the quantity demanded to change. It is important to distinguish between movement along a demand curve, and a shift in a demand curve. Movements along a demand curve happen only when the price of the good changes. When a non-price determinant of demand changes the curve shifts.
https://en.wikipedia.org/wiki/Demand_curve
The demand curve, which shows the relationship between the demand of a product and its price, is depicted by using a graph. Price appears on the vertical axis of the graph, while quantity goes on the horizontal axis. Certain factors affect the demand curve. The number of potential buyers that may purchase your company's products or services determines the size of the market. If the size of the market decreases, the demand curve shifts to the left, showing a higher price and fewer potential buyers. If the size of the market increases, the demand curve shifts to the right, showing a lower price and a larger number of potential buyers. Products and services that complement what you offer the market can affect the demand curve.
http://smallbusiness.chron.com/factors-affect-demand-curve-11258.html
what factors shift the money demand curve
'A change in any non-price determinant of demand' is a factor that shift the money demand curve.