Trong mô hình hai quốc gia (1, 2) và hai sản phẩm (X, Y): Năng suất X và Y của Quốc gia 1 là x1 và y1; của Quốc gia 2 là x2 và y2. Yêu cầu của qui luật lợi thế so sánh sẽ không thực hiện được khi: a) x1.x2 = y1.y2 (x1 ≠ x2 ≠ y1 ≠ y2).
b) x1.y1 = x2.y2 (x1 ≠ x2 ≠ y1 ≠ y2).
c) x1.y2 = x2.y1 (x1 ≠ x2 ≠ y1 ≠ y2).
d) Cả ba câu trên đều sai.

The hawthorne works was a large western electric factory with 45,000 employees. during the 1920s and 1930s, hawthorne works was the site of some well-known industrial studies. in one of the studies, researchers investigated the impact of different working conditions on worker productivity. prior to the start of the study, researchers secretly measured workers' productivity for several weeks. then researchers chose two workers, who then chose their own teams. the teams were separated from the general workforce and completed their work in different experiment rooms where the researchers could observe them more easily. over a 5-year period researchers manipulated the structure of the workday for each team (number and duration of breaks and number of hours per shift). for each of these changes in working conditions, the researchers measured the effect on productivity. for some conditions, such as frequent short breaks, workers rebelled by intentionally decreasing productivity.why did the researchers secretly measure the workers' productivity before creating the two treatment groups? a, to create similar treatment groups so that a cause-and-effect relationship could be establishedb, to draw conclusions about the productivity of all workers in the plant based on the test groupsc, to directly control for confounding variablesd, to provide a baseline for measuring worker productivity

Camilo is a self-employed roofer. he reported a profit of $30,000 on his schedule c. he had other taxable income of $5,000. he paid $3,000 for hospitalization insurance. his self-employment tax was $4,656. he paid his former wife $4,000 in court-ordered alimony and $4,000 in child support. what is the amount camilo can deduct in arriving at adjusted gross income (agi)?

Regarding the results of a swot analysis, organizational weaknesses are (a) internal factors that the organization may exploit for a competitive advantage (b) internal factors that the organization needs to fix in order to be competitive (c) mbo skills that should be emphasized (d) skills and capabilities that give an industry advantages problems that a specific industry needs to correct