A tech startup recently announced, "If we expand our marketing efforts, our sales will increase significantly." This assertion is based on past performance where a similar expansion led to a 30% increase in sales within the first quarter. However, the company is aware of changes in market dynamics that could impact results, including increased competition and economic downturns. Therefore, they are considering the expansion based on this past experience.
Which of the following assumptions must be true for the tech startup's conclusion to hold?