I – Which event would shift the supply curve for pipes to the left?

I – Which event would shift the supply curve for pipes to the left? 

1-an increase in subsidies on pipes

2-an increase in taxes on pipes

3-an increase in the number of pipe producers

4-an increase in the price of pipes

II – Which event will cause an increase in the supply of yogurt? 

1-an increase in the price of yogurt

2-an increase in the costs of production of yogurt

3-an increase in the number of sellers in the yogurt market

4-an increase in taxes on the sale of yogurt

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