[solved] The competitive pressures from substitute products tend to be weaker when
there are fewer than 5 sellers of substitute products with idle production capacity.
substitutes have been on the market and available for purchase for fewer than three years.
buyers have high costs in switching to substitutes.
the prices of substitutes are less than 10% higher than the prices being charged by sellers in the industry.
the substitute products that are currently available are weakly differentiated from one another.