The following diagram shows one indifference curve representing the preferences for goods x and y for one consumer. 
What is the marginal rate of substitution between points A and B?
Definitions:
Basic Hole System
A hole basis system of fits in manufacturing where the hole is the component with the basic size, and the shafts are adjusted for different fits.
Basic Size
The theoretical exact size from which the limits of size are determined in dimensioning and tolerancing practices.
Tolerance
The allowable deviation from a standard measurement in the manufacturing process, determining how much a part can vary from a specified dimension.
Locational Transition Fits
A type of fit specifying a range wherein there may be either a slight interference or clearance between parts, used for parts requiring precise alignment.
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