 However, estimating income is not an easy task, and it might be harder for certain organizations such as NPOs (Non-profit organization) being dependent on number of visitors or NGOs (Non-governmental organization) being dependent on donations), or at certain times such as during changes in consumer habits (e.g.consumers avoiding department stores and turning to fast fashion retailers), society values (a company being perceived to be involved in a scandal, e.g.Shell's income in Germany fell by 50% during the Brent Spar crisis), or during economic crises.