Consider input-output model: input matrix: a= r 0.05 0.33 0.19 0.25 0.10 0.38 0.34 1 0.12 0 final-demand vector: d= r 1800 200 900 1) explain economic meaning of the elements 0.25, 0, and 900. (3 points) 2) explain the economic meaning of the second-column sum. (3 points) 3) write out the specific input-output matrix equation for this model. (2 points) 4) solve the model by any method. (8 points) 5) describe in words what your solution mean. (4 points) 6) write out comparative-static derivatives in the form of 7.23" on page 174 in the textbook. (2 points) 7) what does the partial derivative of xı with respect to d2 mean? (2 points)

Who is better at multi-tasking? in business, employees are often asked to perform a complex task when their atten-tion is divided (i.e., multi-tasking). human factors (may 2014) published a study designed to determine whether video game players are better than non–video game play-ers at multi-tasking. each in a sample of 60 college stu-dents was classified as a video game player or a non-player. participants entered a street crossing simulator and were asked to cross a busy street at an unsigned intersec-tion. the simulator was designed to have cars traveling at various high rates of speed in both directions. during the crossing, the students also performed a memory task as a distraction. two variables were measured for each student: (1) a street crossing performance score (measured out of 100 points) and (2) a memory task score (measured out of 20 points). the researchers found no differences in either the street crossing performance or memory task score of video game players and non-gamers. “these results,” say the researchers, “suggest that action video game players [and non-gamers] are equally susceptible to the costs of dividing attention in a complex task”

Josie just bought her first fish tank a 36 -gallon glass aquarium, which she’s been saving up for almost a year to buy. for josie, the fish tank is most likely what type of purchase

Stella company sells only two products, product a and product b. product a product b total selling price $50 $30 variable cost per unit $20 $10 total fixed costs $2,110,000 stella sells two units of product a for each unit it sells of product b. stella faces a tax rate of 40%. stella desires a net afterminustax income of $54,000. the breakeven point in units would be