According to Huerta de Soto, which is the cost incurred when the actor begins a course of action?

According to Huerta de Soto the term ‘cost’ is defined as a subjective term. Cost is whatever the ‘actor’ sacrifices to start a course of action. Evidently the estimate of the cost is always based on the assumption that the ‘cost’ will be lower than the required output. According to Soto this cost is a purely subjective valuation, which means that the output in essence does not have to be higher than the supplied information makes the actor believe.
Which is the benefit of entrepreneurship?

Soto states the goal of the actor is to achieve entrepreneurial profit. Soto takes the definition of entrepreneurial profit from Ludwig von Mises :

“Profit, in a broader sense, is the gain derived from action; it is the increase in satisfaction (decrease in uneasiness) brought about; it is the difference between the higher value attached to the result attained and the lower value attached to the sacrifices made for its attainment; it is, in other words, yield minus cost. To make profit is invariably the aim sought by any action.”

This profit is the incentive that will motivate the actor to take course of action. Soto uses describes profit as the ‘ end ‘ of the entrepreneurial circle.

Describe alertness in relation to entrepreneurship.

Soto uses a definition for alertness in entrepreneurship derived from the description of Kirzner. ‘ Kirzner holds that the exercise of entrepreneurship entails a special alertness; that is, a constant vigilance, which permits a person to discover and grasp what goes on around him.19 ‘
Soto states that it might be better in Spanish to use the term ‘ perspicaz’ because it entails a more detailed description for ‘ alertness in entrepreneurship’ and claims that Kirzner is less accurate because he derives the term from Romanic