You imply that money costs only get cheaper because production moves from higher-wage to lower-wage countries. That is definitely not the only way to reduce costs. In the case of silicon PV, material and energy costs have been reduced by cutting the wastage of raw materials in manufacturing (eg. by recycling intermediate products and by using finer cutting tools), reducing the amount of raw material present in the final product (thinner silicon layers), reducing the purity of raw material required and thus the energy cost of refinement (PV cells used to be made from the same very high purity “nine 9s”, 99.9999999% pure, grade of silicon as is required for CPUs, now they are commonly made with silicon that’s merely “six nines” pure, which needs a fraction of the energy and can be achieved without the use of some of the highly toxic intermediate chemistries involved in the traditional “Siemens process”. Further improvements are still possible, for instance by manipulating existing impurities in the silicon for use as dopants (silicon PV requires trace amounts of phosphorus and boron impurities, both of which are present in the raw material) rather than first purifying then adding dopant elements after the fact.
And that’s just the silicon semiconductor material. Many other improvements are possible in the balance of the system.