Purchasing power developments per person are calculated as year-on-year percentage changes in that person’s standardised disposable household income, adjusted for price changes. These percentage-based income changes are ranked from high to low, with the middle or median value reflecting the purchasing power development of that particular (sub)population. Personal (dynamic) purchasing power may fluctuate for all kinds of reasons. For example, a wage increase, a promotion, taking up of a (new) job, retirement. Furthermore, changes in household composition (e.g. a child moving out or a couple separating) may also result in income changes. All these changes are reflected in the dynamic purchasing power development.
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