If I set variables in the 1st execution of the run() function, will the variables retain their 1st run values on subsequent runs of the run() function or do I need to somehow make them global so they cannot be changed between subsequent runs of the run() function?

Use static to retain latest value, else it is lost once it goes out of scope.

I am using static, however, I set the value after its initalization in the 1st run of the the run() function.

On subsquent runs of the run() function as set by the BarPeriod = 30, will Price be zero or the value from priceHigh() set in the first iteration of the run() function?

I need it to be the value from priceHigh() in the first iteration.

In the run() function:

static var Price = 0;

Price = priceHigh();