What Causes a Shift in Indifference Curve

In short, the slope of the indifference curve changes because the marginal rate of substitution

What does indifference curve depend on?

Many core principles of microeconomics appear in indifference curve analysis, including individual choice, marginal utility theory, income, substitution effects, and the subjective theory of value. Indifference curve analysis emphasizes marginal rates of substitution (MRS) and opportunity costs.

Can an indifference curve cross itself and why?

No, an indifference curve cannot cross itself. It represents the bundles of goods which a consumer is indifferent between having at a certain price of each good. The implication of the satisfaction level at all points is that it is the same.