Which of the following describes a trade deficit?

In the early years of software development the industry had to train its own workers in developing code to build software applications. It was a very costly undertaking as software firms had to shoulder most of the training costs

However, over time the industry began to experience decreasing costs. How and why did this transformation take place?

Assume that an economy experiences both positive population growth and technological progress. Once the economy has achieved balanced growth, we know that the output per worker ratio (K/N) is

A) constant. B) growing at a rate of gA - gN. C) growing at a rate of gN. D) growing at a rate of gA. E) growing at a rate of ? + gA + gN.