let's talk about how to calculate the four firm ratio and what it means. So the four home ratios calculated by looking at that high at that firms who have the highest share off the market. So, for example, in this case, we have firms A, B, C, D, and they each respective free own 25 20 to 20 in 18% of the market. Um, so we're doing here is just adding up these numbers, so if we add them up, we get 15 85. So these four firms produce or own 85% off the market, and this is huge. Then you said in this market, 85% of the goods that are kind of sold and boy come from these four firms. So this number tells you basically how competitive or non competitive the market is with the numbers really high. It means that thes firms are, um, that there's not a lot of competition when the number is slow, then you have a lot of competition. For example, let's say that there's, ah, 100 firms who you know each one owns 1% of the market, right, and in this case for maybe and see would have a share of the market off one 11 and one, so overall that tough for firms would be responsible for 4% of the market. So in this case we can see that it's a very competitive market. The top four firms on Lee Ah produce 4% of this market.