In March $2000,$ lightning hit a power line in Albuquerque, New Mexico. The strike caused a massive surge in the surrounding electrical grid, which in turn started a fire at a local plant owned by Philips Electronics and damaged millions of microchips. As a result, the mobile phone company Ericsson, which purchased the microchips from Philips and had no alternative source, encountered production problems that lasted for months and caused a loss of $$400$ million in sales. If Ericsson had been using in$-$house manufacturing, which advantage would have helped them in this scenario?