In this paper, we will determine the conditions where a level hypersurface (curve) will preserve the character of the original function. The applications are in the theory of the utility and in the theory of production functions.

The article deals a number of issues regarding the use of mathematics in economics. The end of construction entails a different approach. Good organization of its with bright windows on each floor, gives confidence and calls the frightened yesterday, to come and admire both crystal mirrors...

The paper treats the consumer behavior after the nature of its preferences. There are analyzed in terms of Marshall demand, the perfectly substitutable, the perfectly complementary, the case of independently goods in the meaning of utility, the case of separable goods in the meaning of utility...

In the consumer’s theory, a crucial problem is to determine the substitution effect and the revenue effect in the case of one good price’s modifing. There exists two theories due to John Richard Hicks and Eugen Slutsky which allocates differents shares of the total change of the consumption...

This paper solves the problem of maximization of the total utility in integer numbers, using first the analysis of integer cases and after with the linear programming in integer numbers.

This paper solves in a different way the problem of maximization of the total utility for n goods. The author uses the diophantic equations (equations in integer numbers) and after a decomposing in different cases, he obtains the maximal utility.

In the consumer’s theory, a crucial problem is to determine the substitution effect and the revenue effect in the case of one good price’s modifing. There exists two theories due to John Richard Hicks and Eugen Slutsky which allocates differents shares of the total change of the consumption...

This paper solves in a different way the problem of maximization of the total utility using the linear programming in integer numbers. The author uses the diofantic equations (equations in integers numbers) and after a decomposing in different cases, he obtains the maximal utility.