The article discusses three estimates of demand gap in the years 1996 - 2002. One is based on the production function, the other two - on the method of estimating long-term product trends, which uses co-integrated relations (based on production function and the permanent income hypothesis). The time-relations of the demand gaps and selected inflation indicators were also analysed by means of covariation of the VAR type stochastic process. The methods applied result in different demand gap estimations. The origin and nature of the gaps and the analysis of relations (provided that the correlation represented by the Phillips curve is present in the Polish economy and that the resulting gaps can be applied here) point to a lack of inflation pressure from the demand sector, which should last at least until the end of 2003.