Select all that are true about the result of the productivity calculation? A negative number means that it costs more to produce a product than you are selling it for. Productivity is the highest priority when pursuing a broad differentiation strategy. The calculation result is helpful if it can be compared to your company's productivity over time. The calculation result is helpful if it can be compared to a competitor's productivity. A number close to zero means low productivty. A raw number on its own is not very useful