Knickerbocker's theory does not explain why the first firm in an oligopoly decides to undertake FDI rather than to export or license. (Hills, 2008) also suggested that the imitative theory does not address the issue of whether FDI is more efficient than exporting or licensing for expanding abroad.
Isometrically, the lower back, the upper back, the abdominals, the trunk muscles, the costal muscles, and the shoulders and arms are all essential to the exercise and thus are trained when squatting with the proper form.
Lunges work similar muscles to squats, but not exactly the same. You also have to remember that you're doing the same work, with all of your weight on one leg, rather than two. I find that lunges work the muscles on the inside of my knees more than squats.