Final answer:
It is true that quantifying the impact of IT on worker productivity is challenging as productivity measurement in modern jobs is not always straightforward.
Step-by-step explanation:
The statement “It is difficult to quantify how much the use of IT has contributed to worker productivity” is indeed true. While productivity can be defined as the amount produced per unit of input, such as labor hours, many modern jobs, including those in IT, do not lend themselves to easy measurement of individual output. For example, measuring the productivity of an accountant in a large tax department can be complex. Furthermore, there are alternative methods to measure productivity, such as using GDP (output) per worker (input), but these may not reflect individual productivity accurately. Wage adjustments based on productivity levels can be rough estimations and are often conducted based on past productivity trends rather than direct observation.