In the past two fiscal years, we have experienced increased competition for employees, increased employee turnover, and increased wage inflation. The labor market has been especially tight in Minnesota. We have significantly increased the wages we pay to remain competitive and attract new workers, especially production workers. Labor shortages could impact our revenue and profitability, and increases in labor costs could adversely affect our profit margins and results of operations. The loss of supply from any of our key single-source wafer suppliers could substantially impact our ability to produce and deliver products and seriously harm our business and financial condition.
Our critical suppliers include suppliers of certain raw silicon and semiconductor foundry wafers that are incorporated in our products. We maintain inventory of some critical wafers, but we have not identified or qualified alternate suppliers for many of the wafers now being obtained from single sources. In the past fiscal year, there were industry-wide semiconductor wafer shortages. We purchase some wafers from manufacturers in China, which have been subject to tariffs and could be subject to further tariffs or restrictions in the future. Wafer supply could be affected by acts of God such as floods, typhoons, cyclones, earthquakes, or pandemics, and risks related to extreme weather may be exacerbated by the effects of climate change. Wafer supply interruptions for any reason could seriously jeopardize our ability to provide products that are critical to our business and operations and may cause us to lose revenue. Shortages of any critical chemicals or supplies could impact our ability to produce and deliver products and cause loss of revenue.
There are a number of critical chemicals and supplies that we require to make products. These include certain gases, photoresists, polymers, metals, and specialized alloys. We maintain inventory of critical chemicals and materials, but in many cases, we are dependent on single sources, and some of the materials could be subject to shortages or be discontinued by their suppliers at any time. The Russia-Ukraine crisis could cause or exacerbate shortages. Sanctions against Russia could affect supplies or prices of materials supplied by Russia, including materials we use such as aluminum, copper, helium, magnesium, manganese, nickel, palladium, platinum, and titanium. Materials supplied by Ukraine include neon, which may be used to produce some of our foundry wafers. Supply interruptions or shortages for any reason could seriously jeopardize our ability to provide products that are critical to our business and operations and may cause us to lose revenue.A loss of supply from any of our packaging vendors could impact our ability to deliver products and cause loss of revenue.
We are dependent on our packaging vendors. Because of the unique materials our products use, the complexity of some of our products, unique magnetic requirements, and high isolation voltage specifications, many of our products are more challenging to package than conventional integrated circuits. We have alternate vendors or potential alternate vendors for the majority of our products, but it could be expensive, time-consuming, or impractical to convert to another vendor in the event of a supply interruption due to vendors' business decisions, business conditions, or acts of God, including floods, typhoons, earthquakes, or pandemics. Furthermore, we may not be able to recover work in process or finished goods at a packaging vendor in the event of a disruption. Additionally, certain of our packaging vendors are in flood-susceptible areas. Flooding risks to such vendors may increase in the future due to possible higher ocean levels, extreme weather, and other potential effects of climate change. Supply delays, interruptions, or loss of inventory could seriously jeopardize our ability to provide products that are critical to our business and operations and may cause us to lose revenue.