Conversation so far:
where was the first silicon photovoltaic cell developed
Photovoltaic technology is born in the United States in 1954 when Daryl Chapin, Calvin Fuller, and Gerald Pearson develop the silicon photovoltaic cell at Bell Lab.

Question: what was the cost of the cell per watt
Self-contained rewrite: what was the cost per watt of photovoltaic cells back in the 50s